CINXE.COM

<!DOCTYPE html> <html class="no-js" lang="en"> <head><link rel="canonical" href="https://www.stsci.edu/hst/instrumentation/acs/software-tools/calibration-tools" /> <meta charset="utf-8"> <meta http-equiv="x-ua-compatible" content="ie=edge"> <meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=yes"> <meta name="description" content=""> <meta name="target_country" content="us"> <meta property="og:locale" content="en_US"> <meta property="og:title" content="Calibration Tools"> <meta property="og:description" content=""> <meta property="og:type" content="website"> <meta property="og:site_name" content="STScI"> <meta property="og:url" content="https://www.stsci.edu/home/hst/instrumentation/acs/software-tools/calibration-tools"> <meta property="og:image" content="https://www.stsci.edu/modules/stsci-www-assets/assets/favicons/android-chrome-256x256.png"> <meta property="og:image:type" content="image/png"> <meta property="og:image:alt" content=""> <title>Calibration Tools | STScI</title> <link rel="apple-touch-icon-precomposed" href="/modules/stsci-www-assets/assets/favicons/apple-touch-icon-precomposed.png"> <link rel="apple-touch-icon" href="/modules/stsci-www-assets/assets/favicons/apple-touch-icon.png"> <link rel="apple-touch-icon" sizes="57x57" href="/modules/stsci-www-assets/assets/favicons/apple-touch-icon-57x57.png"> <link rel="apple-touch-icon" sizes="60x60" href="/modules/stsci-www-assets/assets/favicons/apple-touch-icon-60x60.png"> <link rel="apple-touch-icon" sizes="72x72" href="/modules/stsci-www-assets/assets/favicons/apple-touch-icon-72x72.png"> <link rel="apple-touch-icon" sizes="76x76" href="/modules/stsci-www-assets/assets/favicons/apple-touch-icon-76x76.png"> <link rel="apple-touch-icon" sizes="114x114" href="/modules/stsci-www-assets/assets/favicons/apple-touch-icon-114x114.png"> <link rel="apple-touch-icon" sizes="120x120" href="/modules/stsci-www-assets/assets/favicons/apple-touch-icon-120x120.png"> <link rel="apple-touch-icon" sizes="144x144" href="/modules/stsci-www-assets/assets/favicons/apple-touch-icon-144x144.png"> <link rel="apple-touch-icon" sizes="152x152" href="/modules/stsci-www-assets/assets/favicons/apple-touch-icon-152x152.png"> <link rel="apple-touch-icon" sizes="180x180" href="/modules/stsci-www-assets/assets/favicons/apple-touch-icon-180x180.png"> <meta name="apple-mobile-web-app-capable" content="yes"> <meta name="apple-mobile-web-app-status-bar-style" content="black-translucent"> <meta name="apple-mobile-web-app-title" content="Q Starter Kit"> <link rel="icon" type="image/png" sizes="228x228" href="/modules/stsci-www-assets/assets/favicons/coast-228x228.png"> <link rel="icon" type="image/png" sizes="32x32" href="/modules/stsci-www-assets/assets/favicons/favicon-32x32.png"> <link rel="icon" type="image/png" sizes="192x192" href="/modules/stsci-www-assets/assets/favicons/android-chrome-192x192.png"> <link rel="icon" type="image/png" sizes="16x16" href="/modules/stsci-www-assets/assets/favicons/favicon-16x16.png"> <link rel="shortcut icon" href="/modules/stsci-www-assets/assets/favicons/favicon.ico"> <link rel="manifest" href="/modules/stsci-www-assets/assets/favicons/manifest.json"> <meta name="mobile-web-app-capable" content="yes"> <meta name="theme-color" content="#fff"> <meta name="application-name" content="Q Starter Kit"> <meta name="msapplication-TileColor" content="#fff"> <meta name="msapplication-TileImage" content="/modules/stsci-www-assets/assets/favicons/mstile-144x144.png"> <meta name="msapplication-config" content="/modules/stsci-www-assets/assets/favicons/browserconfig.xml"> <meta name="ucode" content="7EjHDCsimuhXhSQbYRmjcRWav3ttb3oEyGA9w9gU"> <link rel="apple-touch-startup-image" media="(width: 320px) and (height: 480px) and (-webkit-device-pixel-ratio: 1)" href="/modules/stsci-www-assets/assets/favicons/apple-touch-startup-image-320x460.png"> <link rel="apple-touch-startup-image" media="(width: 320px) and (height: 480px) and (-webkit-device-pixel-ratio: 2)" href="/modules/stsci-www-assets/assets/favicons/apple-touch-startup-image-640x920.png"> <link rel="apple-touch-startup-image" media="(width: 320px) and (height: 568px) and (-webkit-device-pixel-ratio: 2)" href="/modules/stsci-www-assets/assets/favicons/apple-touch-startup-image-640x1096.png"> <link rel="apple-touch-startup-image" media="(width: 375px) and (height: 667px) and (-webkit-device-pixel-ratio: 2)" href="/modules/stsci-www-assets/assets/favicons/apple-touch-startup-image-750x1294.png"> <link rel="apple-touch-startup-image" media="(width: 414px) and (height: 736px) and (orientation: landscape) and (-webkit-device-pixel-ratio: 3)" href="/modules/stsci-www-assets/assets/favicons/apple-touch-startup-image-1182x2208.png"> <link rel="apple-touch-startup-image" media="(width: 414px) and (height: 736px) and (orientation: portrait) and (-webkit-device-pixel-ratio: 3)" href="/modules/stsci-www-assets/assets/favicons/apple-touch-startup-image-1242x2148.png"> <link rel="apple-touch-startup-image" media="(width: 768px) and (height: 1024px) and (orientation: landscape) and (-webkit-device-pixel-ratio: 1)" href="/modules/stsci-www-assets/assets/favicons/apple-touch-startup-image-748x1024.png"> <link rel="apple-touch-startup-image" media="(width: 768px) and (height: 1024px) and (orientation: portrait) and (-webkit-device-pixel-ratio: 1)" href="/modules/stsci-www-assets/assets/favicons/apple-touch-startup-image-768x1004.png"> <link rel="apple-touch-startup-image" media="(width: 768px) and (height: 1024px) and (orientation: landscape) and (-webkit-device-pixel-ratio: 2)" href="/modules/stsci-www-assets/assets/favicons/apple-touch-startup-image-1496x2048.png"> <link rel="apple-touch-startup-image" media="(width: 768px) and (height: 1024px) and (orientation: portrait) and (-webkit-device-pixel-ratio: 2)" href="/modules/stsci-www-assets/assets/favicons/apple-touch-startup-image-1536x2008.png">  <link href="//vjs.zencdn.net/8.3.0/video-js.min.css" rel="stylesheet"> <link rel="stylesheet" href="/modules/stsci-www-assets/assets/css/www-override-cc4c25f30f.css" media="all" type="text/css"/> <script src="/modules/stsci-www-assets/assets/js/app-9f174fa77e5619a497e6.js"></script> <script>(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start': new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0], j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src= 'https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f); })(window,document,'script','dataLayer','GTM-WLHX35S'); </script> <script type="application/json" id="jahia-data-ctx">{"contextPath":"","lang":"en","uilang":"en","siteUuid":"d85e23b0-e23b-4e9c-8429-7026227a8d6c","wcag":false,"ckeCfg":""}</script> <script type="application/json" id="jahia-data-ck">{"path":"/modules/ckeditor/javascript/","lng":"en_US"}</script> <link id="staticAssetCSS0" rel="stylesheet" href="/generated-resources/16cef494ee99505377bb18df4b84767a.min.css" media="screen" type="text/css"/> <script id="staticAssetJavascript0" src="/generated-resources/4d5bb6b6b14233ca815c36ff2ce9dd.min.js" ></script> <script src="https://www.google.com/recaptcha/api.js?render=6Lf1JKUUAAAAADlRmvbTMzYD_fmo83Av-gytnpXw"></script> <script > $(document).ready(function() { const siteSearchForm = { searchForm: document.getElementById('search-input'), submitHandler: function submitHandler(e) { e.preventDefault(); grecaptcha.ready(function() { grecaptcha.execute('6Lf1JKUUAAAAADlRmvbTMzYD_fmo83Av-gytnpXw', {action: 'searchSubmission'}).then(function(token) { $('#search-input').prepend('<input type="hidden" name="token" value="' + token + '">'); $('#search-input').prepend('<input type="hidden" name="action" value="searchSubmission">'); document.getElementById('search-input').submit(); }); }); }, }; siteSearchForm.searchForm.onsubmit = siteSearchForm.submitHandler; }); </script> <script type="application/json" id="jahia-data-aggregatedjs">{"scripts":["/modules/stsci-www-components/javascript/highlight.pack.js"]}</script> </head> <body id="body" data-module-core="offcanvas-nav media-queries focus-links scroll-anchor-links mathjax img-lightbox link-icons touch-detector list-style" data-site-key="www" class="www">  <noscript> <iframe src="https://www.googletagmanager.com/ns.html?id=GTM-WLHX35S" height="0" width="0" style="display:none;visibility:hidden"> </iframe> </noscript> <header class="site-header"> <a href="#top-of-page" data-module-dynamic="scroll-to" class="skip-to-main btn">Skip to main content</a> <div class="navbar navbar-default clearfix container-fluid"> <div class="h2"> <div class="svg-sprite -stsci-logo logo"> <div class="logo-container"> <a href="/home" class=" no-file-icon" > <picture class="flex-ratio"><img alt="STScI: Space Telescope Science Institute" src="/files/live/sites/www/files/home/_images/stsci-logo-small-test.png?t=thumbnail" srcset="/files/live/sites/www/files/home/_images/stsci-logo-small-test.png?t=thumbnail 150w, /files/live/sites/www/files/home/_images/stsci-logo-small-test.png?t=tn370 370w, /files/live/sites/www/files/home/_images/stsci-logo-small-test.png?t=tn768 768w" sizes="370px" /></picture><noscript><img alt="STScI: Space Telescope Science Institute" class="noscript-img null" src="/files/live/sites/www/files/home/_images/stsci-logo-small-test.png?t=thumbnail" srcset="/files/live/sites/www/files/home/_images/stsci-logo-small-test.png?t=thumbnail 150w, /files/live/sites/www/files/home/_images/stsci-logo-small-test.png?t=tn370 370w, /files/live/sites/www/files/home/_images/stsci-logo-small-test.png?t=tn768 768w" sizes="370px" /></noscript></a></div></div> </div> <div class="button-div"> <div class="search-widget clearfix pull-left" data-module-core="search-widget"> <button class="btn navbar-btn search-widget__toggle advanced-search-toggle" aria-expanded="false" aria-label="search"> <span class="svg-sprite -close"> <svg role="img" focusable="false" aria-hidden="true"> <use xlink:href="#close"></use> </svg> </span> <span class="svg-sprite -search"> <svg role="img" focusable="false" aria-hidden="true"> <use xlink:href="#search"></use> </svg> </span> <span class="hidden-xs" aria-hidden="true">Search</span> </button> <div id="advancedSearch" class="search-widget__panel js-search-panel" style="display:none;"> <div class="search-widget__input-group clearfix"> <form method="post" autocomplete="off" name="searchForm" action="/search-results.searchVerifyRecaptcha.do" id="search-input" class="Form search-widget__form search-widget__search-field dark-background-" > <input type="hidden" name="jcrMethodToCall" value="get" /> <input type="hidden" name="src_originSiteKey" value="www"/> <input type="hidden" id="searchURL" name="searchURL" value="/hst/instrumentation/acs/software-tools/calibration-tools.default"/> <label for="searchTerm">Search for news, events, etc.</label> <input name="src_terms[0].term" placeholder="Enter Search Terms" id="searchTerm" type="text" class="form-control" value=""/> <input type="hidden" name="src_terms[0].applyFilter" value="true"/> <input type="hidden" value="true" name="src_terms[0].fields.siteContent"> <input type="hidden" value="true" name="src_terms[0].fields.fileContent"> <input type="hidden" value="true" name="src_terms[0].fields.description"> <input type="hidden" value="true" name="src_terms[0].fields.title"> <input type="hidden" value="true" name="src_terms[0].fields.keywords"> <input type="hidden" value="false" name="src_terms[0].fields.tags"> <div class="exact-phrase" id="exact-phrase"> <p>Do not include words like a, and, for, the, etc.</p> </div> <div class="search-help" > <p><a href="/search-results/advanced-search-syntax">Advanced Query Syntax</a></p> </div> <label class="left" for="searchMethod"> Search Method</label> <input type="hidden" name="src_sites.values" value="www"/><input type="hidden" name="src_sitesForReferences.values" value="systemsite"/> <input name="src_pagePath.value" id="src_pagePath_value" type="hidden" value="/sites/www"/> <input type="hidden" name="src_pagePath.includeChildren" value="true"/> <select name="src_terms[0].match" id="searchMethod" > <option value="all_words" >All These Words</option> <option value="exact_phrase" >This Exact Phrase</option> <option value="any_word" >Any of These Words</option> <option value="as_is" >Advanced</option> </select> <div id="search-documents-criteria"> <label class="left" for="searchNodeType"> Content Type</label> <select id="searchNodeType" name="src_nodeType"> <option value="jnt:page" >Page</option> <option value="stnt:newsFilterable" >News</option> <option value="stmix:searchableNewsletterArticle" >Newsletter Article</option> <option value="stnt:event" >Event</option> <option value="stmix:searchableAnnualReport" >Annual Report</option> <option value="stmix:hstdocs" >HST User Documentation</option> <option value="stmix:jwstdocs" >JWST User Documentation</option> <option value="jnt:file" >File</option> <option value="stmix:searchableContent" >All Searchable Content</option> </select> </div> <div id="searchOrderByContainer"><label class="left" for="searchOrderBy"> Sort By</label> <input id="searchOrderOperand" type="hidden" name="src_orderings[0].operand" value="score"> <select id="searchOrderBy" name="src_orderings[0].propertyName"> <option id="searchOrderByScore" value="score" selected>Relevancy Score</option> <option id="searchOrderByDate" value="jcr:lastModified">Date</option> </select> </div> <div class="divButton"> <input type="submit" name="search" class="btn" value="Submit"/> </div> <div class="recaptcha-branding"> <div>This site is protected by reCAPTCHA and the Google</div> <div><a href="https://policies.google.com/privacy" target="_blank">Privacy Policy</a> and <a href="https://policies.google.com/terms" target="_blank">Terms of Service</a> apply.</div> </div> </form></div> </div> </div><button class="navbar-btn js-nav-btn btn" aria-expanded="false" aria-label="Main Menu" aria-controls="MainMenu"> <span class="svg-sprite -hamburger"> <svg role="img" aria-hidden="true" focusable="false"> <use xlink:href="#hamburger"></use> </svg> </span> <span class="hidden-xs">Menu</span> </button> </div> </div> </header> <nav class="offcanvas is-at-top-level" aria-label="Main Menu" id="MainMenu"> <div class="offcanvas__control-bar"> <button class="navbar-btn js-nav-btn btn pull-right" aria-expanded="false" aria-label="Main Menu" aria-controls="MainMenu" tabindex="-1"> <span>Menu</span> <span class="svg-sprite -close"> <svg role="img" aria-hidden="true" focusable="false"><use xlink:href="#close"></use></svg> </span> </button> </div> <h2 id="h2-sr-only-main-navigation" class="sr-only">Main Navigation</h2> <div class="offcanvas__scroll-wrapper"> <div class="back-to-main"> <a href="/home" tabindex="-1">STScI Home</a> </div> <ul role="list" class="offcanvas__list" data-level="1"><li class="offcanvas__item hasChildren firstInLevel"><a href='/who-we-are' class="offcanvas__section-link" >Who We Are</a><button class="offcanvas__section-toggle" id="Who_We_Are_0_control" type="button" aria-label="Who We Are submenu" aria-controls="Who_We_Are_0_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Who_We_Are_0_section" class="offcanvas__list" data-level="2" aria-labelledby="Who_We_Are_0_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/who-we-are/stsci-annual-reports' class="offcanvas__section-link" >STScI Annual Reports</a></li><li class="offcanvas__item hasChildren"><a href='/who-we-are/our-history' class="offcanvas__section-link" >Our History</a><button class="offcanvas__section-toggle" id="Our_History_1_control" type="button" aria-label="Our History submenu" aria-controls="Our_History_1_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Our_History_1_section" class="offcanvas__list" data-level="3" aria-labelledby="Our_History_1_control"><li class="offcanvas__item noChildren firstInLevel lastInLevel"><a href='/who-we-are/our-history/stsci-timeline' class="offcanvas__section-link" >STScI Timeline</a></li></ul></li><li class="offcanvas__item noChildren"><a href='/who-we-are/leadership/jennifer-m-lotz' class="offcanvas__section-link" >Meet Our Director</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/who-we-are/leadership' class="offcanvas__section-link" >Leadership</a></li></ul></li><li class="offcanvas__item noChildren"><a href='/what-we-do' class="offcanvas__section-link" >What We Do</a></li><li class="offcanvas__item hasChildren inPath"><a href='/hst' class="offcanvas__section-link" >Hubble Space Telescope</a><button class="offcanvas__section-toggle" id="Hubble_Space_Telescope_2_control" type="button" aria-label="Hubble Space Telescope submenu" aria-controls="Hubble_Space_Telescope_2_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Hubble_Space_Telescope_2_section" class="offcanvas__list" data-level="2" aria-labelledby="Hubble_Space_Telescope_2_control"><li class="offcanvas__item hasChildren firstInLevel"><a href='/hst/about' class="offcanvas__section-link" >About</a><button class="offcanvas__section-toggle" id="About_3_control" type="button" aria-label="About submenu" aria-controls="About_3_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="About_3_section" class="offcanvas__list" data-level="3" aria-labelledby="About_3_control"><li class="offcanvas__item hasChildren firstInLevel"><a href='/hst/about/key-science-themes' class="offcanvas__section-link" >Key Science Themes</a><button class="offcanvas__section-toggle" id="Key_Science_Themes_4_control" type="button" aria-label="Key Science Themes submenu" aria-controls="Key_Science_Themes_4_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Key_Science_Themes_4_section" class="offcanvas__list" data-level="4" aria-labelledby="Key_Science_Themes_4_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/about/key-science-themes/solar-system' class="offcanvas__section-link" >Solar System</a></li><li class="offcanvas__item noChildren"><a href='/hst/about/key-science-themes/exoplanets' class="offcanvas__section-link" >Exoplanets</a></li><li class="offcanvas__item noChildren"><a href='/hst/about/key-science-themes/stars-and-their-environments' class="offcanvas__section-link" >Stars and Their Environments</a></li><li class="offcanvas__item noChildren"><a href='/hst/about/key-science-themes/galaxies' class="offcanvas__section-link" >Galaxies</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/about/key-science-themes/cosmology' class="offcanvas__section-link" >Cosmology</a></li></ul></li><li class="offcanvas__item noChildren"><a href='/hst/about/hst-scorecard' class="offcanvas__section-link" >HST Scorecard</a></li><li class="offcanvas__item noChildren"><a href='https://hubblesite.org/mission-and-telescope/mission-timeline' class="offcanvas__section-link" target='_blank' >History</a></li><li class="offcanvas__item noChildren"><a href='/hst/about/key-individuals' class="offcanvas__section-link" >Key Individuals</a></li><li class="offcanvas__item hasChildren lastInLevel"><a href='/hst/about/space-telescope-users-committee' class="offcanvas__section-link" >Space Telescope Users Committee</a><button class="offcanvas__section-toggle" id="Space_Telescope_Users_Committee_5_control" type="button" aria-label="Space Telescope Users Committee submenu" aria-controls="Space_Telescope_Users_Committee_5_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Space_Telescope_Users_Committee_5_section" class="offcanvas__list" data-level="4" aria-labelledby="Space_Telescope_Users_Committee_5_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/about/space-telescope-users-committee/membership' class="offcanvas__section-link" >Membership</a></li><li class="offcanvas__item noChildren"><a href='/hst/about/space-telescope-users-committee/committee-reports' class="offcanvas__section-link" >Committee Reports</a></li><li class="offcanvas__item noChildren"><a href='/hst/about/space-telescope-users-committee/presentations-and-documentation' class="offcanvas__section-link" >Presentations and Documentation</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/about/space-telescope-users-committee/hst-repair-contingency-plans' class="offcanvas__section-link" >HST Repair Contingency Plans</a></li></ul></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/proposing' class="offcanvas__section-link" >Proposing</a><button class="offcanvas__section-toggle" id="Proposing_6_control" type="button" aria-label="Proposing submenu" aria-controls="Proposing_6_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Proposing_6_section" class="offcanvas__list" data-level="3" aria-labelledby="Proposing_6_control"><li class="offcanvas__item hasChildren firstInLevel"><a href='/hst/proposing/phase-i' class="offcanvas__section-link" >Phase I</a><button class="offcanvas__section-toggle" id="Phase_I_7_control" type="button" aria-label="Phase I submenu" aria-controls="Phase_I_7_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Phase_I_7_section" class="offcanvas__list" data-level="4" aria-labelledby="Phase_I_7_control"><li class="offcanvas__item noChildren firstInLevel"><a href='https://hst-docs.stsci.edu/display/HSP/' class="offcanvas__section-link" target='_blank' >Call for Proposals</a></li><li class="offcanvas__item noChildren"><a href='https://hst-docs.stsci.edu/hsp/hst-cycle-32-director-s-discretionary-time-submission' class="offcanvas__section-link" target='_blank' >Director's Discretionary Time Submission</a></li><li class="offcanvas__item hasChildren"><a href='/hst/proposing/phase-i/proposal-planning-toolbox' class="offcanvas__section-link" >Proposal Planning Toolbox</a><button class="offcanvas__section-toggle" id="Proposal_Planning_Toolbox_8_control" type="button" aria-label="Proposal Planning Toolbox submenu" aria-controls="Proposal_Planning_Toolbox_8_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Proposal_Planning_Toolbox_8_section" class="offcanvas__list" data-level="5" aria-labelledby="Proposal_Planning_Toolbox_8_control"><li class="offcanvas__item noChildren firstInLevel"><a href='http://etc.stsci.edu/etc/' class="offcanvas__section-link" target='_blank' >Exposure Time Calculator</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/proposing/phase-i/proposal-planning-toolbox/orbital-visibility-and-scheduling' class="offcanvas__section-link" >Orbital Visibility and Scheduling</a></li></ul></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/proposing/phase-i/peer-review-information' class="offcanvas__section-link" >Peer Review Information</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/proposing/phase-ii' class="offcanvas__section-link" >Phase II</a><button class="offcanvas__section-toggle" id="Phase_II_9_control" type="button" aria-label="Phase II submenu" aria-controls="Phase_II_9_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Phase_II_9_section" class="offcanvas__list" data-level="4" aria-labelledby="Phase_II_9_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/proposing/phase-ii/phase-ii-proposal-preparation' class="offcanvas__section-link" >Phase II Proposal Preparation</a></li><li class="offcanvas__item noChildren"><a href='https://hst-docs.stsci.edu/display/HPIOM/' class="offcanvas__section-link" target='_blank' >Phase II Proposal Instructions</a></li><li class="offcanvas__item noChildren"><a href='/hst/proposing/phase-ii/visit-size-recommendations' class="offcanvas__section-link" >Visit Size Recommendations</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/proposing/phase-ii/guidelines-and-documents' class="offcanvas__section-link" >Guidelines and Documents</a></li></ul></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/proposing/approved-programs' class="offcanvas__section-link" >Approved Programs</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/observing' class="offcanvas__section-link" >Observing</a><button class="offcanvas__section-toggle" id="Observing_10_control" type="button" aria-label="Observing submenu" aria-controls="Observing_10_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Observing_10_section" class="offcanvas__list" data-level="3" aria-labelledby="Observing_10_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/observing/scheduling' class="offcanvas__section-link" >Scheduling</a></li><li class="offcanvas__item noChildren"><a href='/hst/observing/activating-your-target-of-opportunity' class="offcanvas__section-link" >Activating Your Target of Opportunity</a></li><li class="offcanvas__item noChildren"><a href='/hst/observing/observing-status' class="offcanvas__section-link" >Observing Status</a></li><li class="offcanvas__item noChildren"><a href='/hst/observing/program-information' class="offcanvas__section-link" >Program Information</a></li><li class="offcanvas__item hasChildren lastInLevel"><a href='/hst/observing/post-observation' class="offcanvas__section-link" >Post-Observation</a><button class="offcanvas__section-toggle" id="Post-Observation_11_control" type="button" aria-label="Post-Observation submenu" aria-controls="Post-Observation_11_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Post-Observation_11_section" class="offcanvas__list" data-level="4" aria-labelledby="Post-Observation_11_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/observing/post-observation/data-analysis-toolbox' class="offcanvas__section-link" >Data Analysis Toolbox</a></li><li class="offcanvas__item hasChildren"><a href='/hst/observing/post-observation/exception-reports' class="offcanvas__section-link" >Exception Reports</a><button class="offcanvas__section-toggle" id="Exception_Reports_12_control" type="button" aria-label="Exception Reports submenu" aria-controls="Exception_Reports_12_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Exception_Reports_12_section" class="offcanvas__list" data-level="5" aria-labelledby="Exception_Reports_12_control"><li class="offcanvas__item noChildren firstInLevel lastInLevel"><a href='/hst/observing/post-observation/exception-reports/gs-acq-failed-to-single-guide-star' class="offcanvas__section-link" >GS ACQ Failed to Single Guide Star</a></li></ul></li><li class="offcanvas__item noChildren"><a href='/hst/observing/post-observation/reporting-problems' class="offcanvas__section-link" >Reporting Problems</a></li><li class="offcanvas__item noChildren"><a href='http://archive.stsci.edu/hst/index.html' class="offcanvas__section-link" target='_blank' >Retrieving Data on MAST</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='https://hla.stsci.edu' class="offcanvas__section-link" target='_blank' >Hubble Legacy Archive</a></li></ul></li></ul></li><li class="offcanvas__item hasChildren inPath"><a href='/hst/instrumentation' class="offcanvas__section-link" >Instrumentation</a><button class="offcanvas__section-toggle" id="Instrumentation_13_control" type="button" aria-label="Instrumentation submenu" aria-controls="Instrumentation_13_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Instrumentation_13_section" class="offcanvas__list" data-level="3" aria-labelledby="Instrumentation_13_control"><li class="offcanvas__item hasChildren inPath firstInLevel"><a href='/hst/instrumentation/acs' class="offcanvas__section-link" >Advanced Camera for Surveys</a><button class="offcanvas__section-toggle" id="Advanced_Camera_for_Surveys_14_control" type="button" aria-label="Advanced Camera for Surveys submenu" aria-controls="Advanced_Camera_for_Surveys_14_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Advanced_Camera_for_Surveys_14_section" class="offcanvas__list" data-level="4" aria-labelledby="Advanced_Camera_for_Surveys_14_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/acs/instrument-design' class="offcanvas__section-link" >Instrument Design</a></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/acs/performance' class="offcanvas__section-link" >Performance</a><button class="offcanvas__section-toggle" id="Performance_15_control" type="button" aria-label="Performance submenu" aria-controls="Performance_15_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Performance_15_section" class="offcanvas__list" data-level="5" aria-labelledby="Performance_15_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/acs/performance/anneal-dates' class="offcanvas__section-link" >Anneal Dates</a></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/acs/performance/anomalies-and-artifacts' class="offcanvas__section-link" >Anomalies and Artifacts</a><button class="offcanvas__section-toggle" id="Anomalies_and_Artifacts_16_control" type="button" aria-label="Anomalies and Artifacts submenu" aria-controls="Anomalies_and_Artifacts_16_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Anomalies_and_Artifacts_16_section" class="offcanvas__list" data-level="6" aria-labelledby="Anomalies_and_Artifacts_16_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/acs/performance/anomalies-and-artifacts/dragons-breath-and-edge-glow' class="offcanvas__section-link" >Dragon's Breath and Edge Glow</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/acs/performance/anomalies-and-artifacts/guidestars' class="offcanvas__section-link" >Guidestars</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/acs/performance/cte-information' class="offcanvas__section-link" >CTE Information</a><button class="offcanvas__section-toggle" id="CTE_Information_17_control" type="button" aria-label="CTE Information submenu" aria-controls="CTE_Information_17_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="CTE_Information_17_section" class="offcanvas__list" data-level="6" aria-labelledby="CTE_Information_17_control"><li class="offcanvas__item noChildren firstInLevel lastInLevel"><a href='/hst/instrumentation/acs/performance/cte-information/post-sm4-internal-cte-for-wfc' class="offcanvas__section-link" >Post-SM4 Internal CTE for WFC</a></li></ul></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/acs/performance/photometric-cte-corrections' class="offcanvas__section-link" >Photometric CTE Corrections</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/acs/performance/pixel-based-cte-corrections' class="offcanvas__section-link" >Pixel-Based CTE Corrections</a></li><li class="offcanvas__item hasChildren lastInLevel"><a href='/hst/instrumentation/acs/performance/prism--grism' class="offcanvas__section-link" >Prism / Grism</a><button class="offcanvas__section-toggle" id="Prism_-_Grism_18_control" type="button" aria-label="Prism / Grism submenu" aria-controls="Prism_-_Grism_18_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Prism_-_Grism_18_section" class="offcanvas__list" data-level="6" aria-labelledby="Prism_-_Grism_18_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/acs/performance/prism--grism/acs-axe-downloadable-files' class="offcanvas__section-link" >ACS aXe Downloadable files</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/acs/performance/prism--grism/wfc-g800l' class="offcanvas__section-link" >WFC G800L</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/acs/performance/prism--grism/hrc-g800l' class="offcanvas__section-link" >HRC G800L</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/acs/performance/prism--grism/hrc-pr200l' class="offcanvas__section-link" >HRC PR200L</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/acs/performance/prism--grism/sbc-pr110l-and-pr130l' class="offcanvas__section-link" >SBC PR110L and PR130L</a></li></ul></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/acs/proposing' class="offcanvas__section-link" >Proposing</a><button class="offcanvas__section-toggle" id="Proposing_19_control" type="button" aria-label="Proposing submenu" aria-controls="Proposing_19_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Proposing_19_section" class="offcanvas__list" data-level="5" aria-labelledby="Proposing_19_control"><li class="offcanvas__item noChildren firstInLevel"><a href='http://etc.stsci.edu/etc/' class="offcanvas__section-link" target='_blank' >ACS ETC</a></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/acs/proposing/dither-strategies' class="offcanvas__section-link" >Dither Strategies</a><button class="offcanvas__section-toggle" id="Dither_Strategies_20_control" type="button" aria-label="Dither Strategies submenu" aria-controls="Dither_Strategies_20_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Dither_Strategies_20_section" class="offcanvas__list" data-level="6" aria-labelledby="Dither_Strategies_20_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/acs/proposing/dither-strategies/acs-wfc-dither-line' class="offcanvas__section-link" >ACS-WFC-DITHER-LINE</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/acs/proposing/dither-strategies/acs-wfc-dither-box' class="offcanvas__section-link" >ACS-WFC-DITHER-BOX</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/acs/proposing/dither-strategies/acs-wfc-mosaic-line' class="offcanvas__section-link" >ACS-WFC-MOSAIC-LINE</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/acs/proposing/dither-strategies/acs-wfc-mosaic-box' class="offcanvas__section-link" >ACS-WFC-MOSAIC-BOX</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/acs/proposing/dither-strategies/acs-hrc-dither-line' class="offcanvas__section-link" >ACS-HRC-DITHER-LINE</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/acs/proposing/dither-strategies/acs-hrc-dither-box' class="offcanvas__section-link" >ACS-HRC-DITHER-BOX</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/acs/proposing/dither-strategies/acs-hrc-mosaic-line' class="offcanvas__section-link" >ACS-HRC-MOSAIC-LINE</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/acs/proposing/dither-strategies/acs-hrc-mosaic-box' class="offcanvas__section-link" >ACS-HRC-MOSAIC-BOX</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/acs/proposing/dither-strategies/acs-sbc-dither-line' class="offcanvas__section-link" >ACS-SBC-DITHER-LINE</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/acs/proposing/dither-strategies/acs-sbc-dither-box' class="offcanvas__section-link" >ACS-SBC-DITHER-BOX</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/acs/proposing/dither-strategies/acs-sbc-mosaic-line' class="offcanvas__section-link" >ACS-SBC-MOSAIC-LINE</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/acs/proposing/dither-strategies/acs-sbc-mosaic-box' class="offcanvas__section-link" >ACS-SBC-MOSAIC-BOX</a></li></ul></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/acs/proposing/exception-report-instructions' class="offcanvas__section-link" >Exception Report Instructions</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/acs/data-analysis' class="offcanvas__section-link" >Data Analysis</a><button class="offcanvas__section-toggle" id="Data_Analysis_21_control" type="button" aria-label="Data Analysis submenu" aria-controls="Data_Analysis_21_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Data_Analysis_21_section" class="offcanvas__list" data-level="5" aria-labelledby="Data_Analysis_21_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/acs/data-analysis/aperture-corrections' class="offcanvas__section-link" >Aperture Corrections</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/acs/data-analysis/distortion' class="offcanvas__section-link" >Distortion</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/acs/data-analysis/dq-flag-definitions' class="offcanvas__section-link" >DQ Flag Definitions</a></li><li class="offcanvas__item noChildren"><a href='http://drizzlepac.stsci.edu/' class="offcanvas__section-link" target='_blank' >DrizzlePac</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/acs/data-analysis/pixel-area-maps' class="offcanvas__section-link" >Pixel Area Maps</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/acs/data-analysis/system-throughputs' class="offcanvas__section-link" >System Throughputs</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/acs/data-analysis/zeropoints' class="offcanvas__section-link" >Zeropoints</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/acs/data-analysis/photometric-transformations' class="offcanvas__section-link" >Photometric Transformations</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/acs/calibration' class="offcanvas__section-link" >Calibration</a><button class="offcanvas__section-toggle" id="Calibration_22_control" type="button" aria-label="Calibration submenu" aria-controls="Calibration_22_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Calibration_22_section" class="offcanvas__list" data-level="5" aria-labelledby="Calibration_22_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/acs/calibration/calibration-plans' class="offcanvas__section-link" >Calibration Plans</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools' class="offcanvas__section-link" target='_self' >Reference Files</a></li></ul></li><li class="offcanvas__item hasChildren inPath"><a href='/hst/instrumentation/acs/software-tools' class="offcanvas__section-link" >Software Tools</a><button class="offcanvas__section-toggle" id="Software_Tools_23_control" type="button" aria-label="Software Tools submenu" aria-controls="Software_Tools_23_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Software_Tools_23_section" class="offcanvas__list" data-level="5" aria-labelledby="Software_Tools_23_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/acs/software-tools/analysis-tools' class="offcanvas__section-link" >Analysis Tools</a></li><li class="offcanvas__item noChildren inPath selected"><a href='/hst/instrumentation/acs/software-tools/calibration-tools' class="offcanvas__section-link" aria-current='page'>Calibration Tools</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='http://drizzlepac.readthedocs.io/en/deployment/index.html' class="offcanvas__section-link" target='_blank' >DrizzlePac</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/acs/documentation' class="offcanvas__section-link" >Documentation</a><button class="offcanvas__section-toggle" id="Documentation_24_control" type="button" aria-label="Documentation submenu" aria-controls="Documentation_24_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Documentation_24_section" class="offcanvas__list" data-level="5" aria-labelledby="Documentation_24_control"><li class="offcanvas__item noChildren firstInLevel"><a href='https://hst-docs.stsci.edu/acsihb' class="offcanvas__section-link" target='_blank' >ACS Instrument Handbook</a></li><li class="offcanvas__item noChildren"><a href='https://hst-docs.stsci.edu/acsdhb' class="offcanvas__section-link" target='_blank' >ACS Data Handbook</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/acs/documentation/instrument-science-reports-isrs' class="offcanvas__section-link" >Instrument Science Reports (ISRs)</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/acs/documentation/stsci-analysis-newsletter-stan' class="offcanvas__section-link" >STScI Analysis Newsletter (STAN)</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/acs/documentation/conference-posters' class="offcanvas__section-link" >Conference Posters</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/acs/shortcuts' class="offcanvas__section-link" >Shortcuts</a><button class="offcanvas__section-toggle" id="Shortcuts_25_control" type="button" aria-label="Shortcuts submenu" aria-controls="Shortcuts_25_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Shortcuts_25_section" class="offcanvas__list" data-level="5" aria-labelledby="Shortcuts_25_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/acs/documentation/instrument-science-reports-isrs' class="offcanvas__section-link" target='_parent' >ACS ISRs</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/acs/documentation/stsci-analysis-newsletter-stan' class="offcanvas__section-link" target='_parent' >ACS STANs</a></li><li class="offcanvas__item noChildren"><a href='http://etc.stsci.edu/etc/input/acs/imaging/' class="offcanvas__section-link" target='_blank' >ACS Imaging ETC</a></li><li class="offcanvas__item noChildren"><a href='http://etc.stsci.edu/etc/input/acs/spectroscopic/' class="offcanvas__section-link" target='_blank' >ACS Spectroscopic ETC</a></li><li class="offcanvas__item noChildren"><a href='http://etc.stsci.edu/etc/input/acs/rampfilter/' class="offcanvas__section-link" target='_blank' >ACS Ramp Filter ETC</a></li><li class="offcanvas__item noChildren"><a href='/hst/proposing' class="offcanvas__section-link" target='_self' >HST Proposing</a></li><li class="offcanvas__item noChildren"><a href='/hst/proposing/phase-i' class="offcanvas__section-link" target='_blank' >Phase I Proposals</a></li><li class="offcanvas__item noChildren"><a href='/hst/proposing/phase-ii' class="offcanvas__section-link" target='_self' >Phase II Proposal</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='https://hst-docs.stsci.edu/display/HSP/The+Hubble+Space+Telescope+Primer+for+Cycle+32' class="offcanvas__section-link" target='_blank' >HST Cycle 32 Primer</a></li></ul></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/cos' class="offcanvas__section-link" >Cosmic Origins Spectrograph</a><button class="offcanvas__section-toggle" id="Cosmic_Origins_Spectrograph_26_control" type="button" aria-label="Cosmic Origins Spectrograph submenu" aria-controls="Cosmic_Origins_Spectrograph_26_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Cosmic_Origins_Spectrograph_26_section" class="offcanvas__list" data-level="4" aria-labelledby="Cosmic_Origins_Spectrograph_26_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/cos/instrument-design' class="offcanvas__section-link" >Instrument Design</a></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/cos/performance' class="offcanvas__section-link" >Performance</a><button class="offcanvas__section-toggle" id="Performance_27_control" type="button" aria-label="Performance submenu" aria-controls="Performance_27_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Performance_27_section" class="offcanvas__list" data-level="5" aria-labelledby="Performance_27_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/cos/performance/monitoring' class="offcanvas__section-link" >Monitoring</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/performance/sensitivity' class="offcanvas__section-link" >Sensitivity</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/cos/performance/spectral-resolution' class="offcanvas__section-link" >Spectral Resolution and Line Spread Functions</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/cos/proposing' class="offcanvas__section-link" >Proposing</a><button class="offcanvas__section-toggle" id="Proposing_28_control" type="button" aria-label="Proposing submenu" aria-controls="Proposing_28_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Proposing_28_section" class="offcanvas__list" data-level="5" aria-labelledby="Proposing_28_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/cos/proposing/cos2025-policies' class="offcanvas__section-link" >COS2025 Policies</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/proposing/observing-strategies' class="offcanvas__section-link" >Observing Strategies</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/cos/proposing/wavelength-tool' class="offcanvas__section-link" >Wavelength Tool</a></li></ul></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/data-analysis--software-tools' class="offcanvas__section-link" >Data Analysis & Software Tools</a></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/cos/calibration' class="offcanvas__section-link" >Calibration</a><button class="offcanvas__section-toggle" id="Calibration_29_control" type="button" aria-label="Calibration submenu" aria-controls="Calibration_29_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Calibration_29_section" class="offcanvas__list" data-level="5" aria-labelledby="Calibration_29_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/cos/calibration/airglow' class="offcanvas__section-link" >Airglow</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/calibration/cycle-31-calibration-plan' class="offcanvas__section-link" >Cycle 31 Calibration Plan</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/calibration/cycle-30-calibration-plan' class="offcanvas__section-link" >Cycle 30 Calibration Plan</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/calibration/cycle-29-calibration-plan' class="offcanvas__section-link" >Cycle 29 Calibration Plan</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/calibration/cycle-28-calibration-plan' class="offcanvas__section-link" >Cycle 28 Calibration Plan</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/calibration/cycle-27-calibration-plan' class="offcanvas__section-link" >Cycle 27 Calibration Plan</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/calibration/cycle-26-calibration-plan' class="offcanvas__section-link" >Cycle 26 Calibration Plan</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/calibration/cycle-25-calibration-plan' class="offcanvas__section-link" >Cycle 25 Calibration Plan</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/calibration/cycle-24-calibration-plan' class="offcanvas__section-link" >Cycle 24 Calibration Plan</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/calibration/cycle-23-calibration-plan' class="offcanvas__section-link" >Cycle 23 Calibration Plan</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/calibration/cycle-22-calibration-plan' class="offcanvas__section-link" >Cycle 22 Calibration Plan</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/calibration/cycle-21-calibration-plan' class="offcanvas__section-link" >Cycle 21 Calibration Plan</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/calibration/cycle-20-calibration-plan' class="offcanvas__section-link" >Cycle 20 Calibration Plan</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/calibration/cycle-19-calibration-plan' class="offcanvas__section-link" >Cycle 19 Calibration Plan</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/calibration/cycle-18-calibration-plan' class="offcanvas__section-link" >Cycle 18 Calibration Plan</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/cos/calibration/cycle-17-calibration-plan' class="offcanvas__section-link" >Cycle 17 Calibration Plan</a></li></ul></li><li class="offcanvas__item hasChildren lastInLevel"><a href='/hst/instrumentation/cos/documentation' class="offcanvas__section-link" >Documentation</a><button class="offcanvas__section-toggle" id="Documentation_30_control" type="button" aria-label="Documentation submenu" aria-controls="Documentation_30_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Documentation_30_section" class="offcanvas__list" data-level="5" aria-labelledby="Documentation_30_control"><li class="offcanvas__item noChildren firstInLevel"><a href='https://hst-docs.stsci.edu/display/COSIHB' class="offcanvas__section-link" target='_blank' >COS Instrument Handbook</a></li><li class="offcanvas__item noChildren"><a href='https://hst-docs.stsci.edu/display/COSDHB' class="offcanvas__section-link" target='_blank' >COS Data Handbook</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/documentation/instrument-science-reports-isrs' class="offcanvas__section-link" >Instrument Science Reports (ISRs)</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/documentation/stsci-analysis-newsletter-stan' class="offcanvas__section-link" >STScI Analysis Newsletter (STAN)</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/documentation/exception-report-instructions' class="offcanvas__section-link" >Exception Report Instructions</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/documentation/conference-posters' class="offcanvas__section-link" >Conference Posters</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/cos/documentation/calcos-release-notes' class="offcanvas__section-link" >CalCOS Release Notes</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/cos/documentation/notebooks' class="offcanvas__section-link" >Notebooks</a></li></ul></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/fgs' class="offcanvas__section-link" >Fine Guidance Sensors</a><button class="offcanvas__section-toggle" id="Fine_Guidance_Sensors_31_control" type="button" aria-label="Fine Guidance Sensors submenu" aria-controls="Fine_Guidance_Sensors_31_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Fine_Guidance_Sensors_31_section" class="offcanvas__list" data-level="4" aria-labelledby="Fine_Guidance_Sensors_31_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/fgs/history' class="offcanvas__section-link" >History</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/fgs/instrument-design' class="offcanvas__section-link" >Instrument Design</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/fgs/performance' class="offcanvas__section-link" >Performance</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/fgs/proposing' class="offcanvas__section-link" >Proposing</a></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/fgs/data-analysis' class="offcanvas__section-link" >Data Analysis</a><button class="offcanvas__section-toggle" id="Data_Analysis_32_control" type="button" aria-label="Data Analysis submenu" aria-controls="Data_Analysis_32_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Data_Analysis_32_section" class="offcanvas__list" data-level="5" aria-labelledby="Data_Analysis_32_control"><li class="offcanvas__item noChildren firstInLevel lastInLevel"><a href='/hst/instrumentation/fgs/data-analysis/software-tools' class="offcanvas__section-link" >Software Tools</a></li></ul></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/fgs/documentation' class="offcanvas__section-link" >Documentation</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/stis' class="offcanvas__section-link" >Space Telescope Imaging Spectrograph</a><button class="offcanvas__section-toggle" id="Space_Telescope_Imaging_Spectrograph_33_control" type="button" aria-label="Space Telescope Imaging Spectrograph submenu" aria-controls="Space_Telescope_Imaging_Spectrograph_33_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Space_Telescope_Imaging_Spectrograph_33_section" class="offcanvas__list" data-level="4" aria-labelledby="Space_Telescope_Imaging_Spectrograph_33_control"><li class="offcanvas__item hasChildren firstInLevel"><a href='/hst/instrumentation/stis/instrument-design' class="offcanvas__section-link" >Instrument Design</a><button class="offcanvas__section-toggle" id="Instrument_Design_34_control" type="button" aria-label="Instrument Design submenu" aria-controls="Instrument_Design_34_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Instrument_Design_34_section" class="offcanvas__list" data-level="5" aria-labelledby="Instrument_Design_34_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/stis/instrument-design/apertures' class="offcanvas__section-link" >Apertures</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/stis/instrument-design/detectors' class="offcanvas__section-link" >Detectors</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/stis/instrument-design/filters' class="offcanvas__section-link" >Filters</a></li><li class="offcanvas__item hasChildren lastInLevel"><a href='/hst/instrumentation/stis/instrument-design/gratings--prism' class="offcanvas__section-link" >Gratings / Prism</a><button class="offcanvas__section-toggle" id="Gratings_-_Prism_35_control" type="button" aria-label="Gratings / Prism submenu" aria-controls="Gratings_-_Prism_35_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Gratings_-_Prism_35_section" class="offcanvas__list" data-level="6" aria-labelledby="Gratings_-_Prism_35_control"><li class="offcanvas__item noChildren firstInLevel lastInLevel"><a href='/hst/instrumentation/stis/instrument-design/gratings--prism/spectral-format-plots' class="offcanvas__section-link" >Spectral Format Plots</a></li></ul></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/stis/performance' class="offcanvas__section-link" >Performance</a><button class="offcanvas__section-toggle" id="Performance_36_control" type="button" aria-label="Performance submenu" aria-controls="Performance_36_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Performance_36_section" class="offcanvas__list" data-level="5" aria-labelledby="Performance_36_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/stis/performance/anomalies' class="offcanvas__section-link" >Anomalies</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/stis/performance/image-quality' class="offcanvas__section-link" >Image Quality</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/stis/performance/monitoring' class="offcanvas__section-link" >Monitoring</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/stis/performance/sensitivity' class="offcanvas__section-link" >Sensitivity</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/stis/performance/spectral-resolution' class="offcanvas__section-link" >Spectral Resolution</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/stis/performance/throughput' class="offcanvas__section-link" >Throughput</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/stis/performance/background-noise' class="offcanvas__section-link" >Background Noise</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/stis/proposing' class="offcanvas__section-link" >Proposing</a><button class="offcanvas__section-toggle" id="Proposing_37_control" type="button" aria-label="Proposing submenu" aria-controls="Proposing_37_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Proposing_37_section" class="offcanvas__list" data-level="5" aria-labelledby="Proposing_37_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/stis/proposing/go-wavecal-aperture-selection' class="offcanvas__section-link" >GO Wavecal Aperture Selection</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/stis/proposing/exception-reports' class="offcanvas__section-link" >Exception Reports</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/stis/observing-strategies' class="offcanvas__section-link" >Observing Strategies</a><button class="offcanvas__section-toggle" id="Observing_Strategies_38_control" type="button" aria-label="Observing Strategies submenu" aria-controls="Observing_Strategies_38_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Observing_Strategies_38_section" class="offcanvas__list" data-level="5" aria-labelledby="Observing_Strategies_38_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/stis/observing-strategies/target-acquisition' class="offcanvas__section-link" >Target Acquisition</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/stis/observing-strategies/spectroscopy' class="offcanvas__section-link" >Spectroscopy</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/stis/observing-strategies/imaging' class="offcanvas__section-link" >Imaging</a></li><li class="offcanvas__item hasChildren lastInLevel"><a href='/hst/instrumentation/stis/observing-strategies/available-modes' class="offcanvas__section-link" >Available Modes</a><button class="offcanvas__section-toggle" id="Available_Modes_39_control" type="button" aria-label="Available Modes submenu" aria-controls="Available_Modes_39_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Available_Modes_39_section" class="offcanvas__list" data-level="6" aria-labelledby="Available_Modes_39_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/stis/observing-strategies/available-modes/high-contrast-coronagraphy-at-small-inner-working-angles-with-bar5' class="offcanvas__section-link" >High Contrast Coronagraphy at Small Inner Working Angles with BAR5</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/stis/observing-strategies/available-modes/stis-bar5' class="offcanvas__section-link" >STIS BAR5</a></li></ul></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/stis/data-analysis-and-software-tools' class="offcanvas__section-link" >Data Analysis and Software Tools</a><button class="offcanvas__section-toggle" id="Data_Analysis_and_Software_Tools_40_control" type="button" aria-label="Data Analysis and Software Tools submenu" aria-controls="Data_Analysis_and_Software_Tools_40_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Data_Analysis_and_Software_Tools_40_section" class="offcanvas__list" data-level="5" aria-labelledby="Data_Analysis_and_Software_Tools_40_control"><li class="offcanvas__item noChildren firstInLevel lastInLevel"><a href='/hst/instrumentation/stis/data-analysis-and-software-tools/pixel-based-cti' class="offcanvas__section-link" >Pixel Based CTI</a></li></ul></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/stis/calibration' class="offcanvas__section-link" >Calibration</a></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/stis/documentation' class="offcanvas__section-link" >Documentation</a><button class="offcanvas__section-toggle" id="Documentation_41_control" type="button" aria-label="Documentation submenu" aria-controls="Documentation_41_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Documentation_41_section" class="offcanvas__list" data-level="5" aria-labelledby="Documentation_41_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/stis/documentation/instrument-science-reports' class="offcanvas__section-link" >Instrument Science Reports</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/stis/documentation/stsci-analysis-newsletter-stan' class="offcanvas__section-link" >STScI Analysis Newsletter (STAN)</a></li><li class="offcanvas__item noChildren"><a href='https://hst-docs.stsci.edu/stisihb' class="offcanvas__section-link" target='_blank' >STIS Instrument Handbook</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='https://hst-docs.stsci.edu/stisdhb' class="offcanvas__section-link" target='_blank' >STIS Data Handbook</a></li></ul></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/stis/flux-recalibration' class="offcanvas__section-link" >Flux Recalibration</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/wfc3' class="offcanvas__section-link" >Wide Field Camera 3</a><button class="offcanvas__section-toggle" id="Wide_Field_Camera_3_42_control" type="button" aria-label="Wide Field Camera 3 submenu" aria-controls="Wide_Field_Camera_3_42_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Wide_Field_Camera_3_42_section" class="offcanvas__list" data-level="4" aria-labelledby="Wide_Field_Camera_3_42_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/wfc3/instrument-design' class="offcanvas__section-link" >Instrument Design</a></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/wfc3/performance' class="offcanvas__section-link" >Performance</a><button class="offcanvas__section-toggle" id="Performance_43_control" type="button" aria-label="Performance submenu" aria-controls="Performance_43_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Performance_43_section" class="offcanvas__list" data-level="5" aria-labelledby="Performance_43_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/wfc3/performance/usage-statistics' class="offcanvas__section-link" >Usage Statistics</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/wfc3/performance/anomalies' class="offcanvas__section-link" >Anomalies</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/wfc3/performance/cte' class="offcanvas__section-link" >CTE</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/wfc3/performance/ground-testing' class="offcanvas__section-link" >Ground Testing</a></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/wfc3/performance/monitoring' class="offcanvas__section-link" >Monitoring</a><button class="offcanvas__section-toggle" id="Monitoring_44_control" type="button" aria-label="Monitoring submenu" aria-controls="Monitoring_44_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Monitoring_44_section" class="offcanvas__list" data-level="6" aria-labelledby="Monitoring_44_control"><li class="offcanvas__item noChildren firstInLevel lastInLevel"><a href='/hst/instrumentation/wfc3/performance/monitoring/complete-anneal-history' class="offcanvas__section-link" >Complete Anneal History</a></li></ul></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/wfc3/performance/throughputs' class="offcanvas__section-link" >Throughputs</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/wfc3/performance/cal-subsystem' class="offcanvas__section-link" >Cal Subsystem</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/wfc3/proposing' class="offcanvas__section-link" >Proposing</a><button class="offcanvas__section-toggle" id="Proposing_45_control" type="button" aria-label="Proposing submenu" aria-controls="Proposing_45_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Proposing_45_section" class="offcanvas__list" data-level="5" aria-labelledby="Proposing_45_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/wfc3/proposing/dithering-strategies' class="offcanvas__section-link" >Dithering Strategies</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/wfc3/proposing/exception-reports' class="offcanvas__section-link" >Exception Reports</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/wfc3/data-analysis' class="offcanvas__section-link" >Data Analysis</a><button class="offcanvas__section-toggle" id="Data_Analysis_46_control" type="button" aria-label="Data Analysis submenu" aria-controls="Data_Analysis_46_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Data_Analysis_46_section" class="offcanvas__list" data-level="5" aria-labelledby="Data_Analysis_46_control"><li class="offcanvas__item noChildren firstInLevel"><a href='https://github.com/spacetelescope/WFC3Library/tree/master/notebooks/filter_transformations' class="offcanvas__section-link" target='_blank' >Color Conversion Notebook</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/wfc3/data-analysis/full-well-depth' class="offcanvas__section-link" >Full Well Depth</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/wfc3/documentation/grism-resources' class="offcanvas__section-link" >Grism Spectroscopy</a></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/wfc3/data-analysis/ir-flats' class="offcanvas__section-link" >IR Flats</a><button class="offcanvas__section-toggle" id="IR_Flats_47_control" type="button" aria-label="IR Flats submenu" aria-controls="IR_Flats_47_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="IR_Flats_47_section" class="offcanvas__list" data-level="6" aria-labelledby="IR_Flats_47_control"><li class="offcanvas__item noChildren firstInLevel lastInLevel"><a href='/hst/instrumentation/wfc3/data-analysis/ir-flats/blob-delta-flats-from-earth-flat-calibration-images' class="offcanvas__section-link" >Blob Delta-flats from Earth Flat Calibration Images</a></li></ul></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/wfc3/data-analysis/ir-persistence' class="offcanvas__section-link" >IR Persistence</a></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/wfc3/data-analysis/photometric-calibration' class="offcanvas__section-link" >Photometric Calibration</a><button class="offcanvas__section-toggle" id="Photometric_Calibration_48_control" type="button" aria-label="Photometric Calibration submenu" aria-controls="Photometric_Calibration_48_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Photometric_Calibration_48_section" class="offcanvas__list" data-level="6" aria-labelledby="Photometric_Calibration_48_control"><li class="offcanvas__item hasChildren firstInLevel"><a href='/hst/instrumentation/wfc3/data-analysis/photometric-calibration/uvis-photometric-calibration' class="offcanvas__section-link" >UVIS Photometric Calibration</a><button class="offcanvas__section-toggle" id="UVIS_Photometric_Calibration_49_control" type="button" aria-label="UVIS Photometric Calibration submenu" aria-controls="UVIS_Photometric_Calibration_49_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="UVIS_Photometric_Calibration_49_section" class="offcanvas__list" data-level="7" aria-labelledby="UVIS_Photometric_Calibration_49_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/wfc3/data-analysis/photometric-calibration/uvis-photometric-calibration/quad-filter-photometry' class="offcanvas__section-link" >Quad Filter Photometry</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/wfc3/data-analysis/photometric-calibration/uvis-photometric-calibration/uv-filter-modified-keywords' class="offcanvas__section-link" >UV Filter Modified Keywords</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/wfc3/data-analysis/photometric-calibration/uvis-photometric-calibration/previous-uvis-photometric-calibrations' class="offcanvas__section-link" >Previous UVIS Photometric Calibrations</a></li></ul></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/wfc3/data-analysis/photometric-calibration/uvis-encircled-energy' class="offcanvas__section-link" >UVIS Encircled Energy</a></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/wfc3/data-analysis/photometric-calibration/ir-photometric-calibration' class="offcanvas__section-link" >IR Photometric Calibration</a><button class="offcanvas__section-toggle" id="IR_Photometric_Calibration_50_control" type="button" aria-label="IR Photometric Calibration submenu" aria-controls="IR_Photometric_Calibration_50_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="IR_Photometric_Calibration_50_section" class="offcanvas__list" data-level="7" aria-labelledby="IR_Photometric_Calibration_50_control"><li class="offcanvas__item noChildren firstInLevel lastInLevel"><a href='/hst/instrumentation/wfc3/data-analysis/photometric-calibration/ir-photometric-calibration/previous-ir-photometric-calibrations' class="offcanvas__section-link" >Previous IR Photometric Calibrations</a></li></ul></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/wfc3/data-analysis/photometric-calibration/ir-encircled-energy' class="offcanvas__section-link" >IR Encircled Energy</a></li></ul></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/wfc3/data-analysis/pixel-area-maps' class="offcanvas__section-link" >Pixel Area Maps</a></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/wfc3/data-analysis/psf' class="offcanvas__section-link" >PSF</a><button class="offcanvas__section-toggle" id="PSF_51_control" type="button" aria-label="PSF submenu" aria-controls="PSF_51_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="PSF_51_section" class="offcanvas__list" data-level="6" aria-labelledby="PSF_51_control"><li class="offcanvas__item noChildren firstInLevel lastInLevel"><a href='/hst/instrumentation/wfc3/data-analysis/psf/psf-search' class="offcanvas__section-link" >PSF Search</a></li></ul></li><li class="offcanvas__item noChildren"><a href='http://archive.stsci.edu/hst/index.html' class="offcanvas__section-link" target='_blank' >Retrieving Data</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/wfc3/data-analysis/should-i-recalibrate' class="offcanvas__section-link" >Should I Recalibrate?</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/wfc3/data-analysis/uvis-flats' class="offcanvas__section-link" >UVIS Flats</a></li><li class="offcanvas__item noChildren"><a href='/hst/observing/post-observation' class="offcanvas__section-link" >Post-Observation</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/wfc3/data-analysis/uvis-and-ir-distortion-calibration' class="offcanvas__section-link" >UVIS and IR Distortion Calibration</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/wfc3/calibration-plan' class="offcanvas__section-link" >Calibration Plan</a><button class="offcanvas__section-toggle" id="Calibration_Plan_52_control" type="button" aria-label="Calibration Plan submenu" aria-controls="Calibration_Plan_52_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Calibration_Plan_52_section" class="offcanvas__list" data-level="5" aria-labelledby="Calibration_Plan_52_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/wfc3/calibration-plan/tv3-results' class="offcanvas__section-link" >TV3 Results</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/wfc3/calibration-plan/tv2-results' class="offcanvas__section-link" >TV2 Results</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/wfc3/calibration-plan/tv1-results' class="offcanvas__section-link" >TV1 Results</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/wfc3/calibration-plan/old-versions' class="offcanvas__section-link" >Old Versions</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/wfc3/software-tools' class="offcanvas__section-link" >Software Tools</a><button class="offcanvas__section-toggle" id="Software_Tools_53_control" type="button" aria-label="Software Tools submenu" aria-controls="Software_Tools_53_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Software_Tools_53_section" class="offcanvas__list" data-level="5" aria-labelledby="Software_Tools_53_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/wfc3/software-tools/crosstalk' class="offcanvas__section-link" >Crosstalk</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/wfc3/software-tools/cte-tools' class="offcanvas__section-link" >CTE Tools</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/wfc3/software-tools/exposure-time-calculators' class="offcanvas__section-link" >Exposure Time Calculators</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/wfc3/software-tools/pipeline' class="offcanvas__section-link" >Pipeline</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/wfc3/documentation' class="offcanvas__section-link" >Documentation</a><button class="offcanvas__section-toggle" id="Documentation_54_control" type="button" aria-label="Documentation submenu" aria-controls="Documentation_54_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Documentation_54_section" class="offcanvas__list" data-level="5" aria-labelledby="Documentation_54_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/wfc3/documentation/instrument-science-reports-isrs' class="offcanvas__section-link" >Instrument Science Reports (ISRs)</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/wfc3/documentation/stsci-analysis-newsletter-stan' class="offcanvas__section-link" >STScI Analysis Newsletter (STAN)</a></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/wfc3/documentation/grism-resources' class="offcanvas__section-link" >Grism Resources</a><button class="offcanvas__section-toggle" id="Grism_Resources_55_control" type="button" aria-label="Grism Resources submenu" aria-controls="Grism_Resources_55_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Grism_Resources_55_section" class="offcanvas__list" data-level="6" aria-labelledby="Grism_Resources_55_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/wfc3/documentation/grism-resources/grism-data-analysis' class="offcanvas__section-link" >Grism Data Analysis</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/wfc3/documentation/grism-resources/wfc3-ir-grism-data-reduction-cookbook' class="offcanvas__section-link" >WFC3 IR Grism Data Reduction Cookbook</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/wfc3/documentation/grism-resources/grism-frequently-asked-questions' class="offcanvas__section-link" >Grism Frequently Asked Questions</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/wfc3/documentation/grism-resources/ir-grism-sky-images' class="offcanvas__section-link" >IR Grism Sky Images</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/wfc3/documentation/grism-resources/wfc3-g141-calibrations' class="offcanvas__section-link" >WFC3 G141 Calibrations</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/wfc3/documentation/grism-resources/wfc3-g280-calibrations' class="offcanvas__section-link" >WFC3 G280 Calibrations</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/wfc3/documentation/grism-resources/wfc3-g102-calibrations' class="offcanvas__section-link" >WFC3 G102 Calibrations</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/wfc3/documentation/grism-resources/uvis-grism-sky-images' class="offcanvas__section-link" >UVIS Grism Sky Images</a></li></ul></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/wfc3/documentation/conference-posters' class="offcanvas__section-link" >Conference Posters</a></li></ul></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/wfc3/news' class="offcanvas__section-link" >News</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/focus-and-pointing' class="offcanvas__section-link" >Focus and Pointing</a><button class="offcanvas__section-toggle" id="Focus_and_Pointing_56_control" type="button" aria-label="Focus and Pointing submenu" aria-controls="Focus_and_Pointing_56_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Focus_and_Pointing_56_section" class="offcanvas__list" data-level="4" aria-labelledby="Focus_and_Pointing_56_control"><li class="offcanvas__item hasChildren firstInLevel"><a href='/hst/instrumentation/focus-and-pointing/focus' class="offcanvas__section-link" >Focus</a><button class="offcanvas__section-toggle" id="Focus_57_control" type="button" aria-label="Focus submenu" aria-controls="Focus_57_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Focus_57_section" class="offcanvas__list" data-level="5" aria-labelledby="Focus_57_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/focus-and-pointing/focus/secondary-mirror-moves' class="offcanvas__section-link" >Secondary Mirror Moves</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/focus-and-pointing/focus/hst-focus-model' class="offcanvas__section-link" >HST Focus Model</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/focus-and-pointing/focus/tiny-tim-hst-psf-modeling' class="offcanvas__section-link" >Tiny Tim HST PSF Modeling</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/focus-and-pointing/pointing' class="offcanvas__section-link" >Pointing</a><button class="offcanvas__section-toggle" id="Pointing_58_control" type="button" aria-label="Pointing submenu" aria-controls="Pointing_58_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Pointing_58_section" class="offcanvas__list" data-level="5" aria-labelledby="Pointing_58_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/focus-and-pointing/pointing/jitter-file-format-definition' class="offcanvas__section-link" >Jitter File Format Definition</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/focus-and-pointing/pointing/determining-an-observations-orientation' class="offcanvas__section-link" >Determining an Observation鈥檚 Orientation</a></li></ul></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/focus-and-pointing/fov-geometry' class="offcanvas__section-link" >FoV Geometry</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/focus-and-pointing/documentation' class="offcanvas__section-link" >Documentation</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/legacy' class="offcanvas__section-link" >Legacy Instruments</a><button class="offcanvas__section-toggle" id="Legacy_Instruments_59_control" type="button" aria-label="Legacy Instruments submenu" aria-controls="Legacy_Instruments_59_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Legacy_Instruments_59_section" class="offcanvas__list" data-level="4" aria-labelledby="Legacy_Instruments_59_control"><li class="offcanvas__item hasChildren firstInLevel"><a href='/hst/instrumentation/legacy/nicmos' class="offcanvas__section-link" >NICMOS</a><button class="offcanvas__section-toggle" id="NICMOS_60_control" type="button" aria-label="NICMOS submenu" aria-controls="NICMOS_60_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="NICMOS_60_section" class="offcanvas__list" data-level="5" aria-labelledby="NICMOS_60_control"><li class="offcanvas__item noChildren firstInLevel lastInLevel"><a href='/hst/instrumentation/legacy/nicmos/instrument-science-reports-isrs' class="offcanvas__section-link" >Instrument Science Reports (ISRs)</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/legacy/wfpc2' class="offcanvas__section-link" >WFPC2</a><button class="offcanvas__section-toggle" id="WFPC2_61_control" type="button" aria-label="WFPC2 submenu" aria-controls="WFPC2_61_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="WFPC2_61_section" class="offcanvas__list" data-level="5" aria-labelledby="WFPC2_61_control"><li class="offcanvas__item noChildren firstInLevel lastInLevel"><a href='/hst/instrumentation/legacy/wfpc2/instrument-science-reports-isrs' class="offcanvas__section-link" >Instrument Science Reports (ISRs)</a></li></ul></li></ul></li><li class="offcanvas__item hasChildren lastInLevel"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools' class="offcanvas__section-link" >Reference Data for Calibration and Tools</a><button class="offcanvas__section-toggle" id="Reference_Data_for_Calibration_and_Tools_62_control" type="button" aria-label="Reference Data for Calibration and Tools submenu" aria-controls="Reference_Data_for_Calibration_and_Tools_62_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Reference_Data_for_Calibration_and_Tools_62_section" class="offcanvas__list" data-level="4" aria-labelledby="Reference_Data_for_Calibration_and_Tools_62_control"><li class="offcanvas__item noChildren firstInLevel"><a href='https://hst-crds.stsci.edu/' class="offcanvas__section-link" target='_blank' >Calibration Reference Data System (CRDS)</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/file-and-table-structures' class="offcanvas__section-link" >File and Table Structures</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/reference-file-retreival-instructions' class="offcanvas__section-link" >Reference File Retrieval Instructions</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/legacy-instrument-reference-files' class="offcanvas__section-link" >Legacy Instrument Reference Files</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/synphot-throughput-tables' class="offcanvas__section-link" >Synphot Throughput Tables</a></li><li class="offcanvas__item hasChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs' class="offcanvas__section-link" >Astronomical Catalogs</a><button class="offcanvas__section-toggle" id="Astronomical_Catalogs_63_control" type="button" aria-label="Astronomical Catalogs submenu" aria-controls="Astronomical_Catalogs_63_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Astronomical_Catalogs_63_section" class="offcanvas__list" data-level="5" aria-labelledby="Astronomical_Catalogs_63_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/the-agn-atlas' class="offcanvas__section-link" >The AGN Atlas</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/atmo-2020-atmosphere-models' class="offcanvas__section-link" >ATMO 2020 Atmosphere Models</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/brown-dwarfs-and-substellar-objects' class="offcanvas__section-link" >Brown Dwarfs and Substellar Objects</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/bruzual-atlas' class="offcanvas__section-link" >Bruzual Atlas</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/the-bruzual-charlot-atlas' class="offcanvas__section-link" >The Bruzual-Charlot Atlas</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/bruzual-and-charlot-2003' class="offcanvas__section-link" >Bruzual and Charlot 2003</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/bruzual-persson-gunn-stryker-atlas-list' class="offcanvas__section-link" >Bruzual-Persson-Gunn-Stryker Atlas list</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/buser-kurucz-atlas' class="offcanvas__section-link" >Buser-Kurucz Atlas</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/calobs' class="offcanvas__section-link" >CALOBS</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/calspec' class="offcanvas__section-link" >CALSPEC</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/castelli-and-kurucz-atlas' class="offcanvas__section-link" >Castelli and Kurucz Atlas</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/composite-qso-spectra-for-nir' class="offcanvas__section-link" >Composite QSO Spectra for NIR</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/the-galactic-emission-line-object-atlas' class="offcanvas__section-link" >The Galactic Emission Line Object Atlas</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/gunn-stryker-atlas-list' class="offcanvas__section-link" >Gunn-Stryker Atlas list</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/interstellar-extinction-curves' class="offcanvas__section-link" >Interstellar Extinction Curves</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/jacoby-hunter-christian-atlas' class="offcanvas__section-link" >Jacoby-Hunter-Christian Atlas</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/the-kinney-calzetti-spetral-atlas' class="offcanvas__section-link" >The Kinney-Calzetti Spectral Atlas</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/kinney-models' class="offcanvas__section-link" >Kinney Models</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/kurucz-1993-models' class="offcanvas__section-link" >Kurucz 1993 Models</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/non-stellar-spectra' class="offcanvas__section-link" >Non-Stellar Spectra</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/novae-models' class="offcanvas__section-link" >Novae Models</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/phoenix-models-available-in-synphot' class="offcanvas__section-link" >Phoenix Models available in Synphot</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/planetary-nebula-spectra' class="offcanvas__section-link" >Planetary Nebula Spectra</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/pickles-atlas' class="offcanvas__section-link" >Pickles Atlas</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/simple-stellar-population-atlas' class="offcanvas__section-link" >Simple Stellar Population Atlas</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/solar-system-objects-spectra' class="offcanvas__section-link" >Solar System Objects Spectra</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/swire-galaxies' class="offcanvas__section-link" >SWIRE Galaxies</a></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/the-trds-brown-atlas' class="offcanvas__section-link" >The TRDS Brown Atlas</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/astronomical-catalogs/trds-brown19-spectra-of-agns' class="offcanvas__section-link" >TRDS Brown19 Spectra of AGNs</a></li></ul></li><li class="offcanvas__item noChildren"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/modewave-data' class="offcanvas__section-link" >Modewave Data</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/hst/instrumentation/reference-data-for-calibration-and-tools/documentation' class="offcanvas__section-link" >Documentation</a></li></ul></li></ul></li><li class="offcanvas__item hasChildren"><a href='/hst/documentation' class="offcanvas__section-link" >Documentation</a><button class="offcanvas__section-toggle" id="Documentation_64_control" type="button" aria-label="Documentation submenu" aria-controls="Documentation_64_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Documentation_64_section" class="offcanvas__list" data-level="3" aria-labelledby="Documentation_64_control"><li class="offcanvas__item noChildren firstInLevel lastInLevel"><a href='/hst/documentation/handbook-archive' class="offcanvas__section-link" >Handbook Archive</a></li></ul></li><li class="offcanvas__item hasChildren lastInLevel"><a href='/hst/news-and-events' class="offcanvas__section-link" >News & Events</a><button class="offcanvas__section-toggle" id="News_and_Events_65_control" type="button" aria-label="News and Events submenu" aria-controls="News_and_Events_65_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="News_and_Events_65_section" class="offcanvas__list" data-level="3" aria-labelledby="News_and_Events_65_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/hst/news-and-events/news' class="offcanvas__section-link" >News</a></li><li class="offcanvas__item noChildren"><a href='/hst/news-and-events/articles' class="offcanvas__section-link" >Articles</a></li><li class="offcanvas__item noChildren"><a href='/events' class="offcanvas__section-link" >Events</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='https://hubblesite.org/news/news-releases' class="offcanvas__section-link" target='_blank' >Press</a></li></ul></li></ul></li><li class="offcanvas__item hasChildren"><a href='/jwst' class="offcanvas__section-link" >James Webb Space Telescope</a><button class="offcanvas__section-toggle" id="James_Webb_Space_Telescope_66_control" type="button" aria-label="James Webb Space Telescope submenu" aria-controls="James_Webb_Space_Telescope_66_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="James_Webb_Space_Telescope_66_section" class="offcanvas__list" data-level="2" aria-labelledby="James_Webb_Space_Telescope_66_control"><li class="offcanvas__item hasChildren firstInLevel"><a href='/jwst/about-jwst' class="offcanvas__section-link" >About JWST</a><button class="offcanvas__section-toggle" id="About_JWST_67_control" type="button" aria-label="About JWST submenu" aria-controls="About_JWST_67_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="About_JWST_67_section" class="offcanvas__list" data-level="3" aria-labelledby="About_JWST_67_control"><li class="offcanvas__item hasChildren firstInLevel"><a href='/jwst/about-jwst/history' class="offcanvas__section-link" >History</a><button class="offcanvas__section-toggle" id="History_68_control" type="button" aria-label="History submenu" aria-controls="History_68_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="History_68_section" class="offcanvas__list" data-level="4" aria-labelledby="History_68_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/jwst/about-jwst/history/historical-sensitivity-estimates' class="offcanvas__section-link" >Historical Sensitivity Estimates</a></li><li class="offcanvas__item noChildren"><a href='/jwst/about-jwst/history/jwst-advisory-committee-jstac' class="offcanvas__section-link" >JWST Advisory Committee (JSTAC)</a></li><li class="offcanvas__item noChildren"><a href='/jwst/about-jwst/history/flyers' class="offcanvas__section-link" >Flyers</a></li><li class="offcanvas__item noChildren"><a href='/jwst/about-jwst/history/white-papers' class="offcanvas__section-link" >White Papers</a></li><li class="offcanvas__item noChildren"><a href='/jwst/about-jwst/history/design-reference-mission-drm' class="offcanvas__section-link" >Design Reference Mission (DRM)</a></li><li class="offcanvas__item hasChildren lastInLevel"><a href='/jwst/about-jwst/history/science-operations-design-reference-mission-sodrm' class="offcanvas__section-link" >Science Operations Design Reference Mission (SODRM)</a><button class="offcanvas__section-toggle" id="Science_Operations_Design_Reference_Mission_-SODRM-_69_control" type="button" aria-label="Science Operations Design Reference Mission (SODRM) submenu" aria-controls="Science_Operations_Design_Reference_Mission_-SODRM-_69_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Science_Operations_Design_Reference_Mission_-SODRM-_69_section" class="offcanvas__list" data-level="5" aria-labelledby="Science_Operations_Design_Reference_Mission_-SODRM-_69_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/jwst/about-jwst/history/science-operations-design-reference-mission-sodrm/solar-system-programs' class="offcanvas__section-link" >Solar System Programs</a></li><li class="offcanvas__item noChildren"><a href='/jwst/about-jwst/history/science-operations-design-reference-mission-sodrm/exoplanet-programs' class="offcanvas__section-link" >Exoplanet Programs</a></li><li class="offcanvas__item noChildren"><a href='/jwst/about-jwst/history/science-operations-design-reference-mission-sodrm/galactic-programs' class="offcanvas__section-link" >Galactic Programs</a></li><li class="offcanvas__item noChildren"><a href='/jwst/about-jwst/history/science-operations-design-reference-mission-sodrm/nearby-galaxies-programs' class="offcanvas__section-link" >Nearby Galaxies Programs</a></li><li class="offcanvas__item noChildren"><a href='/jwst/about-jwst/history/science-operations-design-reference-mission-sodrm/distant-galaxies-and-cosmology-programs' class="offcanvas__section-link" >Distant Galaxies and Cosmology Programs</a></li><li class="offcanvas__item noChildren"><a href='/jwst/about-jwst/history/science-operations-design-reference-mission-sodrm/instrumentation-calibration-programs' class="offcanvas__section-link" >Instrumentation Calibration Programs</a></li><li class="offcanvas__item noChildren"><a href='/jwst/about-jwst/history/science-operations-design-reference-mission-sodrm/observation-calibration-programs' class="offcanvas__section-link" >Observation Calibration Programs</a></li><li class="offcanvas__item noChildren"><a href='/jwst/about-jwst/history/science-operations-design-reference-mission-sodrm/statistical-summary' class="offcanvas__section-link" >Statistical Summary</a></li></ul></li></ul></li><li class="offcanvas__item noChildren"><a href='/jwst/about-jwst/stsci-and-jwst' class="offcanvas__section-link" >STScI and JWST</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/jwst/about-jwst/science-themes' class="offcanvas__section-link" >Science Themes</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/jwst/news-events' class="offcanvas__section-link" >News & Events</a><button class="offcanvas__section-toggle" id="News_and_Events_70_control" type="button" aria-label="News and Events submenu" aria-controls="News_and_Events_70_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="News_and_Events_70_section" class="offcanvas__list" data-level="3" aria-labelledby="News_and_Events_70_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/jwst/news-events/news' class="offcanvas__section-link" >News</a></li><li class="offcanvas__item noChildren"><a href='/jwst/news-events/events' class="offcanvas__section-link" >Events</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/jwst/news-events/articles' class="offcanvas__section-link" >Articles</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/jwst/instrumentation' class="offcanvas__section-link" >Instrumentation</a><button class="offcanvas__section-toggle" id="Instrumentation_71_control" type="button" aria-label="Instrumentation submenu" aria-controls="Instrumentation_71_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Instrumentation_71_section" class="offcanvas__list" data-level="3" aria-labelledby="Instrumentation_71_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/jwst/instrumentation/instruments' class="offcanvas__section-link" >Science Instruments</a></li><li class="offcanvas__item noChildren"><a href='/jwst/instrumentation/imaging-modes' class="offcanvas__section-link" >Imaging Modes</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/jwst/instrumentation/spectroscopic-modes' class="offcanvas__section-link" >Spectroscopic Modes</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/jwst/science-planning' class="offcanvas__section-link" >Science Planning</a><button class="offcanvas__section-toggle" id="Science_Planning_72_control" type="button" aria-label="Science Planning submenu" aria-controls="Science_Planning_72_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Science_Planning_72_section" class="offcanvas__list" data-level="3" aria-labelledby="Science_Planning_72_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/jwst/science-planning/calls-for-proposals-and-policy' class="offcanvas__section-link" >Calls for Proposals and Policy</a></li><li class="offcanvas__item hasChildren"><a href='/jwst/science-planning/proposal-planning-toolbox' class="offcanvas__section-link" >Proposal Planning Toolbox</a><button class="offcanvas__section-toggle" id="Proposal_Planning_Toolbox_73_control" type="button" aria-label="Proposal Planning Toolbox submenu" aria-controls="Proposal_Planning_Toolbox_73_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Proposal_Planning_Toolbox_73_section" class="offcanvas__list" data-level="4" aria-labelledby="Proposal_Planning_Toolbox_73_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/jwst/science-planning/proposal-planning-toolbox/exposure-time-calculator' class="offcanvas__section-link" >Exposure Time Calculator</a></li><li class="offcanvas__item noChildren"><a href='/jwst/science-planning/proposal-planning-toolbox/target-visibility-tools' class="offcanvas__section-link" >Target Visibility Tools</a></li><li class="offcanvas__item noChildren"><a href='/jwst/science-planning/proposal-planning-toolbox/psf-simulation-tool' class="offcanvas__section-link" >PSF Simulation Tool</a></li><li class="offcanvas__item noChildren"><a href='/jwst/science-planning/proposal-planning-toolbox/jist' class="offcanvas__section-link" >JIST</a></li><li class="offcanvas__item noChildren"><a href='/jwst/science-planning/proposal-planning-toolbox/sensitivity-and-saturation-limits' class="offcanvas__section-link" >Sensitivity and Saturation Limits</a></li><li class="offcanvas__item noChildren"><a href='/jwst/science-planning/proposal-planning-toolbox/mirage' class="offcanvas__section-link" >Mirage</a></li><li class="offcanvas__item noChildren"><a href='/jwst/science-planning/proposal-planning-toolbox/mirisim' class="offcanvas__section-link" >MIRISim</a></li><li class="offcanvas__item noChildren"><a href='/jwst/science-planning/proposal-planning-toolbox/simulated-data' class="offcanvas__section-link" >Simulated Data</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/jwst/science-planning/proposal-planning-toolbox/proposal-training' class="offcanvas__section-link" >Proposal Training</a></li></ul></li><li class="offcanvas__item noChildren"><a href='/jwst/science-planning/tools-from-the-community' class="offcanvas__section-link" >Tools from the Community</a></li><li class="offcanvas__item hasChildren lastInLevel"><a href='/jwst/science-planning/user-committees' class="offcanvas__section-link" >User Committees</a><button class="offcanvas__section-toggle" id="User_Committees_74_control" type="button" aria-label="User Committees submenu" aria-controls="User_Committees_74_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="User_Committees_74_section" class="offcanvas__list" data-level="4" aria-labelledby="User_Committees_74_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/jwst/science-planning/user-committees/jwst-users-committee' class="offcanvas__section-link" >JWST Users Committee</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/jwst/science-planning/user-committees/jwst-science-working-group' class="offcanvas__section-link" >JWST Science Working Group</a></li></ul></li></ul></li><li class="offcanvas__item hasChildren"><a href='/jwst/science-execution' class="offcanvas__section-link" >Science Execution</a><button class="offcanvas__section-toggle" id="Science_Execution_75_control" type="button" aria-label="Science Execution submenu" aria-controls="Science_Execution_75_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Science_Execution_75_section" class="offcanvas__list" data-level="3" aria-labelledby="Science_Execution_75_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/jwst/science-execution/program-information' class="offcanvas__section-link" >Program Information</a></li><li class="offcanvas__item hasChildren"><a href='/jwst/science-execution/approved-programs' class="offcanvas__section-link" >Approved Programs</a><button class="offcanvas__section-toggle" id="Approved_Programs_76_control" type="button" aria-label="Approved Programs submenu" aria-controls="Approved_Programs_76_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Approved_Programs_76_section" class="offcanvas__list" data-level="4" aria-labelledby="Approved_Programs_76_control"><li class="offcanvas__item hasChildren firstInLevel"><a href='/jwst/science-execution/approved-programs/general-observers' class="offcanvas__section-link" >General Observers</a><button class="offcanvas__section-toggle" id="General_Observers_77_control" type="button" aria-label="General Observers submenu" aria-controls="General_Observers_77_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="General_Observers_77_section" class="offcanvas__list" data-level="5" aria-labelledby="General_Observers_77_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/jwst/science-execution/approved-programs/general-observers/cycle-1-go' class="offcanvas__section-link" >Cycle 1 GO</a></li><li class="offcanvas__item noChildren"><a href='/jwst/science-execution/approved-programs/general-observers/cycle-2-go' class="offcanvas__section-link" >Cycle 2 GO</a></li><li class="offcanvas__item noChildren"><a href='/jwst/science-execution/approved-programs/general-observers/cycle-3-go' class="offcanvas__section-link" >Cycle 3 GO</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/jwst/science-execution/approved-programs/general-observers/cycle-4-go' class="offcanvas__section-link" >Cycle 4 GO</a></li></ul></li><li class="offcanvas__item noChildren"><a href='/jwst/science-execution/approved-programs/guaranteed-time-observations' class="offcanvas__section-link" >Guaranteed Time Observations</a></li><li class="offcanvas__item noChildren"><a href='/jwst/science-execution/approved-programs/directors-discretionary-time' class="offcanvas__section-link" >Director's Discretionary Time</a></li><li class="offcanvas__item hasChildren"><a href='/jwst/science-execution/approved-ers-programs' class="offcanvas__section-link" >DD-ERS</a><button class="offcanvas__section-toggle" id="DD-ERS_78_control" type="button" aria-label="DD-ERS submenu" aria-controls="DD-ERS_78_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="DD-ERS_78_section" class="offcanvas__list" data-level="5" aria-labelledby="DD-ERS_78_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/jwst/science-execution/approved-programs/dd-ers/program-1288' class="offcanvas__section-link" >ERS Program 1288</a></li><li class="offcanvas__item noChildren"><a href='/jwst/science-execution/approved-programs/dd-ers/program-1309' class="offcanvas__section-link" >ERS Program 1309</a></li><li class="offcanvas__item noChildren"><a href='/jwst/science-execution/approved-programs/dd-ers/program-1324' class="offcanvas__section-link" >ERS Program 1324</a></li><li class="offcanvas__item noChildren"><a href='/jwst/science-execution/approved-programs/dd-ers/program-1328' class="offcanvas__section-link" >ERS Program 1328</a></li><li class="offcanvas__item noChildren"><a href='/jwst/science-execution/approved-programs/dd-ers/program-1334' class="offcanvas__section-link" >ERS Program 1334</a></li><li class="offcanvas__item noChildren"><a href='/jwst/science-execution/approved-programs/dd-ers/program-1335' class="offcanvas__section-link" >ERS Program 1335</a></li><li class="offcanvas__item noChildren"><a href='/jwst/science-execution/approved-programs/dd-ers/program-1345' class="offcanvas__section-link" >ERS Program 1345</a></li><li class="offcanvas__item noChildren"><a href='/jwst/science-execution/approved-programs/dd-ers/program-1349' class="offcanvas__section-link" >ERS Program 1349</a></li><li class="offcanvas__item noChildren"><a href='/jwst/science-execution/approved-programs/dd-ers/program-1355' class="offcanvas__section-link" >ERS Program 1355</a></li><li class="offcanvas__item noChildren"><a href='/jwst/science-execution/approved-programs/dd-ers/program-1364' class="offcanvas__section-link" >ERS Program 1364</a></li><li class="offcanvas__item noChildren"><a href='/jwst/science-execution/approved-programs/dd-ers/program-1366' class="offcanvas__section-link" >ERS Program 1366</a></li><li class="offcanvas__item noChildren"><a href='/jwst/science-execution/approved-programs/dd-ers/program-1373' class="offcanvas__section-link" >ERS Program 1373</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/jwst/science-execution/approved-programs/dd-ers/program-1386' class="offcanvas__section-link" >ERS Program 1386</a></li></ul></li><li class="offcanvas__item noChildren"><a href='/jwst/science-execution/approved-programs/calibration' class="offcanvas__section-link" >Calibration</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/jwst/science-execution/approved-programs/webb-first-image-observations' class="offcanvas__section-link" >Webb First Image Observations</a></li></ul></li><li class="offcanvas__item noChildren"><a href='/jwst/science-execution/observing-schedules' class="offcanvas__section-link" >Observing Schedules</a></li><li class="offcanvas__item noChildren"><a href='/jwst/science-execution/jwebbinars' class="offcanvas__section-link" >JWebbinars</a></li><li class="offcanvas__item noChildren"><a href='/jwst/science-execution/data-analysis-toolbox' class="offcanvas__section-link" >Data Analysis Toolbox</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/jwst/science-execution/science-publications' class="offcanvas__section-link" >Science Publications</a></li></ul></li><li class="offcanvas__item hasChildren lastInLevel"><a href='/jwst/documentation' class="offcanvas__section-link" >Documentation</a><button class="offcanvas__section-toggle" id="Documentation_79_control" type="button" aria-label="Documentation submenu" aria-controls="Documentation_79_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Documentation_79_section" class="offcanvas__list" data-level="3" aria-labelledby="Documentation_79_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/jwst/documentation/technical-documents' class="offcanvas__section-link" >Technical Documents</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='https://jwst-docs.stsci.edu/' class="offcanvas__section-link" target='_blank' >JDox</a></li></ul></li></ul></li><li class="offcanvas__item hasChildren"><a href='/roman' class="offcanvas__section-link" >Nancy Grace Roman Space Telescope</a><button class="offcanvas__section-toggle" id="Nancy_Grace_Roman_Space_Telescope_80_control" type="button" aria-label="Nancy Grace Roman Space Telescope submenu" aria-controls="Nancy_Grace_Roman_Space_Telescope_80_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Nancy_Grace_Roman_Space_Telescope_80_section" class="offcanvas__list" data-level="2" aria-labelledby="Nancy_Grace_Roman_Space_Telescope_80_control"><li class="offcanvas__item hasChildren firstInLevel"><a href='/roman/about' class="offcanvas__section-link" >About</a><button class="offcanvas__section-toggle" id="About_81_control" type="button" aria-label="About submenu" aria-controls="About_81_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="About_81_section" class="offcanvas__list" data-level="3" aria-labelledby="About_81_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/roman/about/science-themes' class="offcanvas__section-link" >Science Themes</a></li><li class="offcanvas__item noChildren"><a href='/roman/about/take-part-in-the-mission' class="offcanvas__section-link" >Take Part in the Mission</a></li><li class="offcanvas__item noChildren"><a href='/roman/about/partners' class="offcanvas__section-link" >Partners</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/roman/about/roman-advisory-committee-rstac' class="offcanvas__section-link" >Roman Space Telescope Advisory Committee (RSTAC)</a></li></ul></li><li class="offcanvas__item noChildren"><a href='/roman/surveys-and-programs' class="offcanvas__section-link" >Surveys and Programs</a></li><li class="offcanvas__item noChildren"><a href='/roman/observatory' class="offcanvas__section-link" >Observatory</a></li><li class="offcanvas__item noChildren"><a href='/roman/science-planning-toolbox' class="offcanvas__section-link" >Science Planning Toolbox</a></li><li class="offcanvas__item hasChildren"><a href='/roman/documentation' class="offcanvas__section-link" >Documentation</a><button class="offcanvas__section-toggle" id="Documentation_82_control" type="button" aria-label="Documentation submenu" aria-controls="Documentation_82_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Documentation_82_section" class="offcanvas__list" data-level="3" aria-labelledby="Documentation_82_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/roman/documentation/technical-documentation' class="offcanvas__section-link" >Technical Documentation</a></li><li class="offcanvas__item noChildren"><a href='/roman/documentation/science-publications' class="offcanvas__section-link" >Science Publications</a></li><li class="offcanvas__item noChildren"><a href='https://roman-docs.stsci.edu/' class="offcanvas__section-link" target='_blank' >RDox</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='https://archive.stsci.edu/missions-and-data/roman/' class="offcanvas__section-link" target='_blank' >Roman at MAST</a></li></ul></li><li class="offcanvas__item hasChildren lastInLevel"><a href='/roman/news-and-events' class="offcanvas__section-link" >News & Events</a><button class="offcanvas__section-toggle" id="News_and_Events_83_control" type="button" aria-label="News and Events submenu" aria-controls="News_and_Events_83_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="News_and_Events_83_section" class="offcanvas__list" data-level="3" aria-labelledby="News_and_Events_83_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/roman/news-and-events/news' class="offcanvas__section-link" >News</a></li><li class="offcanvas__item noChildren"><a href='/roman/news-and-events/events' class="offcanvas__section-link" >Events</a></li><li class="offcanvas__item noChildren"><a href='/roman/news-and-events/articles' class="offcanvas__section-link" >Articles</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/roman/news-and-events/press' class="offcanvas__section-link" >Press</a></li></ul></li></ul></li><li class="offcanvas__item noChildren"><a href='http://archive.stsci.edu/' class="offcanvas__section-link" target='_blank' >Mikulski Archive for Space Telescopes (MAST)</a></li><li class="offcanvas__item hasChildren"><a href='/scientific-community' class="offcanvas__section-link" >Scientific Community</a><button class="offcanvas__section-toggle" id="Scientific_Community_84_control" type="button" aria-label="Scientific Community submenu" aria-controls="Scientific_Community_84_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Scientific_Community_84_section" class="offcanvas__list" data-level="2" aria-labelledby="Scientific_Community_84_control"><li class="offcanvas__item hasChildren firstInLevel"><a href='/scientific-community/community-missions' class="offcanvas__section-link" >Community Missions</a><button class="offcanvas__section-toggle" id="Community_Missions_85_control" type="button" aria-label="Community Missions submenu" aria-controls="Community_Missions_85_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Community_Missions_85_section" class="offcanvas__list" data-level="3" aria-labelledby="Community_Missions_85_control"><li class="offcanvas__item hasChildren firstInLevel"><a href='/scientific-community/community-missions/services' class="offcanvas__section-link" >Services</a><button class="offcanvas__section-toggle" id="Services_86_control" type="button" aria-label="Services submenu" aria-controls="Services_86_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Services_86_section" class="offcanvas__list" data-level="4" aria-labelledby="Services_86_control"><li class="offcanvas__item noChildren firstInLevel lastInLevel"><a href='/scientific-community/community-missions/services/peer-review' class="offcanvas__section-link" >Peer Review</a></li></ul></li><li class="offcanvas__item noChildren"><a href='/scientific-community/community-missions/missions' class="offcanvas__section-link" >Missions</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/scientific-community/community-missions/advanced-concepts' class="offcanvas__section-link" >Advanced Concepts</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/scientific-community/grants-administration' class="offcanvas__section-link" >Grants Administration</a><button class="offcanvas__section-toggle" id="Grants_Administration_87_control" type="button" aria-label="Grants Administration submenu" aria-controls="Grants_Administration_87_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Grants_Administration_87_section" class="offcanvas__list" data-level="3" aria-labelledby="Grants_Administration_87_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/scientific-community/grants-administration/stsci-budget-proposer-guide' class="offcanvas__section-link" >STScI Budget Proposer Guide</a></li><li class="offcanvas__item noChildren"><a href='/scientific-community/grants-administration/stgms-user-guide' class="offcanvas__section-link" >STGMS User Guide</a></li><li class="offcanvas__item noChildren"><a href='/scientific-community/grants-administration/frequently-asked-questions' class="offcanvas__section-link" >Frequently Asked Questions</a></li><li class="offcanvas__item hasChildren lastInLevel"><a href='/scientific-community/grants-administration/nhfp-grant-resources' class="offcanvas__section-link" >NHFP Grant Resources</a><button class="offcanvas__section-toggle" id="NHFP_Grant_Resources_88_control" type="button" aria-label="NHFP Grant Resources submenu" aria-controls="NHFP_Grant_Resources_88_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="NHFP_Grant_Resources_88_section" class="offcanvas__list" data-level="4" aria-labelledby="NHFP_Grant_Resources_88_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/scientific-community/grants-administration/nhfp-grant-resources/nhfp-stgms-user-guide' class="offcanvas__section-link" >NHFP STGMS User Guide</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/scientific-community/grants-administration/nhfp-grant-resources/nhfp-frequently-asked-questions' class="offcanvas__section-link" >NHFP Frequently Asked Questions</a></li></ul></li></ul></li><li class="offcanvas__item hasChildren"><a href='/scientific-community/stsci-library-and-institutional-archive' class="offcanvas__section-link" >STScI Library and Institutional Archive</a><button class="offcanvas__section-toggle" id="STScI_Library_and_Institutional_Archive_89_control" type="button" aria-label="STScI Library and Institutional Archive submenu" aria-controls="STScI_Library_and_Institutional_Archive_89_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="STScI_Library_and_Institutional_Archive_89_section" class="offcanvas__list" data-level="3" aria-labelledby="STScI_Library_and_Institutional_Archive_89_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/scientific-community/stsci-library-and-institutional-archive/our-collections' class="offcanvas__section-link" >Our Collections</a></li><li class="offcanvas__item noChildren"><a href='/scientific-community/stsci-library-and-institutional-archive/institutional-archive' class="offcanvas__section-link" >Institutional Archive</a></li><li class="offcanvas__item hasChildren"><a href='/scientific-community/stsci-library-and-institutional-archive/missions-publications' class="offcanvas__section-link" >Missions Publications</a><button class="offcanvas__section-toggle" id="Missions_Publications_90_control" type="button" aria-label="Missions Publications submenu" aria-controls="Missions_Publications_90_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Missions_Publications_90_section" class="offcanvas__list" data-level="4" aria-labelledby="Missions_Publications_90_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/scientific-community/stsci-library-and-institutional-archive/missions-publications/bibliography-methodology' class="offcanvas__section-link" >Bibliography Methodology</a></li><li class="offcanvas__item noChildren"><a href='https://archive.stsci.edu/publishing/bibliography#/' class="offcanvas__section-link" target='_blank' >Publication Search</a></li><li class="offcanvas__item noChildren"><a href='https://archive.stsci.edu/hst/bibliography/pubstat.html' class="offcanvas__section-link" target='_blank' >Hubble Publication Statistics</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='https://mast.stsci.edu/papertrack/reports/jwst' class="offcanvas__section-link" target='_blank' >Webb Publication Statistics</a></li></ul></li><li class="offcanvas__item noChildren lastInLevel"><a href='https://stsci.on.worldcat.org/discovery' class="offcanvas__section-link" target='_blank' >Our Catalog</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/scientific-community/software' class="offcanvas__section-link" >Software</a><button class="offcanvas__section-toggle" id="Software_91_control" type="button" aria-label="Software submenu" aria-controls="Software_91_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Software_91_section" class="offcanvas__list" data-level="3" aria-labelledby="Software_91_control"><li class="offcanvas__item hasChildren firstInLevel"><a href='/scientific-community/software/astronomers-proposal-tool-apt' class="offcanvas__section-link" >Astronomer's Proposal Tool (APT)</a><button class="offcanvas__section-toggle" id="Astronomeraposs_Proposal_Tool_-APT-_92_control" type="button" aria-label="Astronomer's Proposal Tool (APT) submenu" aria-controls="Astronomeraposs_Proposal_Tool_-APT-_92_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Astronomeraposs_Proposal_Tool_-APT-_92_section" class="offcanvas__list" data-level="4" aria-labelledby="Astronomeraposs_Proposal_Tool_-APT-_92_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/scientific-community/software/astronomers-proposal-tool-apt/linux' class="offcanvas__section-link" >Linux</a></li><li class="offcanvas__item noChildren"><a href='/scientific-community/software/astronomers-proposal-tool-apt/mac-os' class="offcanvas__section-link" >macOS</a></li><li class="offcanvas__item noChildren"><a href='/scientific-community/software/astronomers-proposal-tool-apt/windows' class="offcanvas__section-link" >Windows</a></li><li class="offcanvas__item noChildren"><a href='/scientific-community/software/astronomers-proposal-tool-apt/previous-apt-releases' class="offcanvas__section-link" >Previous APT Releases</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/scientific-community/software/astronomers-proposal-tool-apt/hst-training-materials' class="offcanvas__section-link" >HST Training Materials</a></li></ul></li><li class="offcanvas__item noChildren"><a href='http://etc.stsci.edu/etc/' class="offcanvas__section-link" target='_blank' >Exposure Time Calculator</a></li><li class="offcanvas__item hasChildren"><a href='/scientific-community/software/drizzlepac' class="offcanvas__section-link" >DrizzlePac</a><button class="offcanvas__section-toggle" id="DrizzlePac_93_control" type="button" aria-label="DrizzlePac submenu" aria-controls="DrizzlePac_93_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="DrizzlePac_93_section" class="offcanvas__list" data-level="4" aria-labelledby="DrizzlePac_93_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/scientific-community/software/drizzlepac/features' class="offcanvas__section-link" >Features</a></li><li class="offcanvas__item noChildren"><a href='/scientific-community/software/drizzlepac/frequently-asked-questions' class="offcanvas__section-link" >Frequently Asked Questions</a></li><li class="offcanvas__item noChildren"><a href='/scientific-community/software/drizzlepac/instrument-characteristics' class="offcanvas__section-link" >Instrument Characteristics</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/scientific-community/software/drizzlepac/news' class="offcanvas__section-link" >News</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/scientific-community/software/axe' class="offcanvas__section-link" >HSTaXe</a><button class="offcanvas__section-toggle" id="HSTaXe_94_control" type="button" aria-label="HSTaXe submenu" aria-controls="HSTaXe_94_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="HSTaXe_94_section" class="offcanvas__list" data-level="4" aria-labelledby="HSTaXe_94_control"><li class="offcanvas__item noChildren firstInLevel lastInLevel"><a href='/scientific-community/software/axe/axedrizzle' class="offcanvas__section-link" >aXedrizzle</a></li></ul></li></ul></li><li class="offcanvas__item noChildren lastInLevel"><a href='/scientific-community/scientific-careers' class="offcanvas__section-link" >Scientific Careers</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/stsci-research' class="offcanvas__section-link" >STScI Research</a><button class="offcanvas__section-toggle" id="STScI_Research_95_control" type="button" aria-label="STScI Research submenu" aria-controls="STScI_Research_95_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="STScI_Research_95_section" class="offcanvas__list" data-level="2" aria-labelledby="STScI_Research_95_control"><li class="offcanvas__item hasChildren firstInLevel"><a href='/stsci-research/research-groups' class="offcanvas__section-link" >Research Groups</a><button class="offcanvas__section-toggle" id="Research_Groups_96_control" type="button" aria-label="Research Groups submenu" aria-controls="Research_Groups_96_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Research_Groups_96_section" class="offcanvas__list" data-level="3" aria-labelledby="Research_Groups_96_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/stsci-research/research-groups/active-galactic-nuclei-research-group' class="offcanvas__section-link" >Active Galactic Nuclei Research Group</a></li><li class="offcanvas__item noChildren"><a href='/stsci-research/research-groups/extrasolar-planetary-systems-imaging-group' class="offcanvas__section-link" >Extrasolar Planetary Systems Imaging Group</a></li><li class="offcanvas__item noChildren"><a href='/stsci-research/research-groups/galaxies-and-the-cgm-group' class="offcanvas__section-link" >Galaxies and the CGM Group</a></li><li class="offcanvas__item noChildren"><a href='/stsci-research/research-groups/galaxy-clusters-science-group' class="offcanvas__section-link" >Galaxy Clusters Science Group</a></li><li class="offcanvas__item noChildren"><a href='/stsci-research/research-groups/hstpromo-group' class="offcanvas__section-link" >HSTPROMO Group</a></li><li class="offcanvas__item noChildren"><a href='/stsci-research/research-groups/interstellar-medium-group' class="offcanvas__section-link" >Interstellar Medium* Group</a></li><li class="offcanvas__item noChildren"><a href='/stsci-research/research-groups/jwst-telescope-scientist-team' class="offcanvas__section-link" >JWST Telescope Scientist Team</a></li><li class="offcanvas__item noChildren"><a href='/stsci-research/research-groups/milky-way-halo-group' class="offcanvas__section-link" >Milky Way Halo Group</a></li><li class="offcanvas__item noChildren"><a href='/stsci-research/research-groups/reionization-and-emission-line-galaxies-group' class="offcanvas__section-link" >Reionization and Emission Line Galaxies Group</a></li><li class="offcanvas__item noChildren"><a href='/stsci-research/research-groups/star-and-planet-formation-group' class="offcanvas__section-link" >Star and Planet Formation Group</a></li><li class="offcanvas__item noChildren"><a href='/stsci-research/research-groups/transient-science-space-telescope' class="offcanvas__section-link" >Transient Science @ Space Telescope Group</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/stsci-research/research-groups/transiting-exoplanets-group' class="offcanvas__section-link" >Transiting Exoplanets Group</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/stsci-research/research-topics-and-programs' class="offcanvas__section-link" >Research Topics and Programs</a><button class="offcanvas__section-toggle" id="Research_Topics_and_Programs_97_control" type="button" aria-label="Research Topics and Programs submenu" aria-controls="Research_Topics_and_Programs_97_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Research_Topics_and_Programs_97_section" class="offcanvas__list" data-level="3" aria-labelledby="Research_Topics_and_Programs_97_control"><li class="offcanvas__item hasChildren firstInLevel"><a href='/stsci-research/research-topics-and-programs/russell-b-makidon-optics-laboratory' class="offcanvas__section-link" >Russell B. Makidon Optics Laboratory</a><button class="offcanvas__section-toggle" id="Russell_B-_Makidon_Optics_Laboratory_98_control" type="button" aria-label="Russell B. Makidon Optics Laboratory submenu" aria-controls="Russell_B-_Makidon_Optics_Laboratory_98_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Russell_B-_Makidon_Optics_Laboratory_98_section" class="offcanvas__list" data-level="4" aria-labelledby="Russell_B-_Makidon_Optics_Laboratory_98_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/stsci-research/research-topics-and-programs/russell-b-makidon-optics-laboratory/meet-the-team' class="offcanvas__section-link" >Meet the Team</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/stsci-research/research-topics-and-programs/russell-b-makidon-optics-laboratory/news-from-the-lab' class="offcanvas__section-link" >News from the Lab</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/stsci-research/research-topics-and-programs/institute-for-planets-and-life' class="offcanvas__section-link" >Institute for Planets and Life</a><button class="offcanvas__section-toggle" id="Institute_for_Planets_and_Life_99_control" type="button" aria-label="Institute for Planets and Life submenu" aria-controls="Institute_for_Planets_and_Life_99_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Institute_for_Planets_and_Life_99_section" class="offcanvas__list" data-level="4" aria-labelledby="Institute_for_Planets_and_Life_99_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/stsci-research/research-topics-and-programs/institute-for-planets-and-life/astrophysics' class="offcanvas__section-link" >Astrophysics</a></li><li class="offcanvas__item noChildren"><a href='/stsci-research/research-topics-and-programs/institute-for-planets-and-life/planetary-sciences' class="offcanvas__section-link" >Planetary Sciences</a></li><li class="offcanvas__item noChildren"><a href='/stsci-research/research-topics-and-programs/institute-for-planets-and-life/biological-sciences' class="offcanvas__section-link" >Biological Sciences</a></li><li class="offcanvas__item noChildren"><a href='/stsci-research/research-topics-and-programs/institute-for-planets-and-life/events-and-lectures' class="offcanvas__section-link" >Events and Lectures</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/stsci-research/research-topics-and-programs/institute-for-planets-and-life/related-resources' class="offcanvas__section-link" >Related Resources</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/stsci-research/research-topics-and-programs/exoplanet-and-planetary-science' class="offcanvas__section-link" >Exoplanet and Planetary Science</a><button class="offcanvas__section-toggle" id="Exoplanet_and_Planetary_Science_100_control" type="button" aria-label="Exoplanet and Planetary Science submenu" aria-controls="Exoplanet_and_Planetary_Science_100_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Exoplanet_and_Planetary_Science_100_section" class="offcanvas__list" data-level="4" aria-labelledby="Exoplanet_and_Planetary_Science_100_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/stsci-research/research-topics-and-programs/exoplanet-and-planetary-science/hst-exoplanet-and-planetary-science' class="offcanvas__section-link" >HST Exoplanet and Planetary Science</a></li><li class="offcanvas__item noChildren"><a href='/stsci-research/research-topics-and-programs/exoplanet-and-planetary-science/jwst-exoplanet-and-planetary-science' class="offcanvas__section-link" >JWST Exoplanet and Planetary Science</a></li><li class="offcanvas__item noChildren"><a href='/stsci-research/research-topics-and-programs/exoplanet-and-planetary-science/planet-discovery-and-demographics' class="offcanvas__section-link" >Planet Discovery and Demographics</a></li><li class="offcanvas__item noChildren"><a href='/stsci-research/research-topics-and-programs/exoplanet-and-planetary-science/planet-characterization' class="offcanvas__section-link" >Planet Characterization</a></li><li class="offcanvas__item noChildren"><a href='/stsci-research/research-topics-and-programs/exoplanet-and-planetary-science/solar-system' class="offcanvas__section-link" >Solar System</a></li><li class="offcanvas__item noChildren"><a href='/stsci-research/research-topics-and-programs/exoplanet-and-planetary-science/planetary-system-formation-and-evolution' class="offcanvas__section-link" >Planetary System Formation and Evolution</a></li><li class="offcanvas__item noChildren"><a href='/stsci-research/research-topics-and-programs/exoplanet-and-planetary-science/archives-and-high-level-data-products' class="offcanvas__section-link" >Archives and High Level Data Products</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/stsci-research/research-topics-and-programs/exoplanet-and-planetary-science/software-and-tools' class="offcanvas__section-link" >Software and Tools</a></li></ul></li></ul></li><li class="offcanvas__item noChildren"><a href='/stsci-research/research-directory' class="offcanvas__section-link" >Research Directory</a></li><li class="offcanvas__item hasChildren"><a href='/stsci-research/fellowships' class="offcanvas__section-link" >Fellowships</a><button class="offcanvas__section-toggle" id="Fellowships_101_control" type="button" aria-label="Fellowships submenu" aria-controls="Fellowships_101_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Fellowships_101_section" class="offcanvas__list" data-level="3" aria-labelledby="Fellowships_101_control"><li class="offcanvas__item hasChildren firstInLevel"><a href='/stsci-research/fellowships/nasa-hubble-fellowship-program' class="offcanvas__section-link" >NASA Hubble Fellowship Program</a><button class="offcanvas__section-toggle" id="NASA_Hubble_Fellowship_Program_102_control" type="button" aria-label="NASA Hubble Fellowship Program submenu" aria-controls="NASA_Hubble_Fellowship_Program_102_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="NASA_Hubble_Fellowship_Program_102_section" class="offcanvas__list" data-level="4" aria-labelledby="NASA_Hubble_Fellowship_Program_102_control"><li class="offcanvas__item hasChildren firstInLevel"><a href='/stsci-research/fellowships/nasa-hubble-fellowship-program/announcement-of-opportunity' class="offcanvas__section-link" >Announcement of Opportunity</a><button class="offcanvas__section-toggle" id="Announcement_of_Opportunity_103_control" type="button" aria-label="Announcement of Opportunity submenu" aria-controls="Announcement_of_Opportunity_103_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Announcement_of_Opportunity_103_section" class="offcanvas__list" data-level="5" aria-labelledby="Announcement_of_Opportunity_103_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/stsci-research/fellowships/nasa-hubble-fellowship-program/announcement-of-opportunity/science-categories-and-techniques' class="offcanvas__section-link" >Science Categories and Techniques</a></li><li class="offcanvas__item noChildren"><a href='/stsci-research/fellowships/nasa-hubble-fellowship-program/announcement-of-opportunity/frequently-asked-questions' class="offcanvas__section-link" >Frequently Asked Questions</a></li><li class="offcanvas__item noChildren"><a href='/stsci-research/fellowships/nasa-hubble-fellowship-program/announcement-of-opportunity/advice-for-applicants' class="offcanvas__section-link" >Advice for Applicants</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/stsci-research/fellowships/nasa-hubble-fellowship-program/announcement-of-opportunity/nhfp-selection-rubric' class="offcanvas__section-link" >NHFP Selection Rubric</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/stsci-research/fellowships/nasa-hubble-fellowship-program/host-institutions' class="offcanvas__section-link" >Host Institutions and the NHFP Employment Policy</a><button class="offcanvas__section-toggle" id="Host_Institutions_and_the_NHFP_Employment_Policy_104_control" type="button" aria-label="Host Institutions and the NHFP Employment Policy submenu" aria-controls="Host_Institutions_and_the_NHFP_Employment_Policy_104_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Host_Institutions_and_the_NHFP_Employment_Policy_104_section" class="offcanvas__list" data-level="5" aria-labelledby="Host_Institutions_and_the_NHFP_Employment_Policy_104_control"><li class="offcanvas__item noChildren firstInLevel lastInLevel"><a href='/stsci-research/fellowships/nasa-hubble-fellowship-program/host-institutions/faq' class="offcanvas__section-link" >Frequently Asked Questions</a></li></ul></li><li class="offcanvas__item noChildren"><a href='/stsci-research/fellowships/nasa-hubble-fellowship-program/nhfp-annual-symposia' class="offcanvas__section-link" >NHFP Annual Symposia</a></li><li class="offcanvas__item hasChildren"><a href='/stsci-research/fellowships/nasa-hubble-fellowship-program/resources-for-current-fellows' class="offcanvas__section-link" >Resources for Current Fellows</a><button class="offcanvas__section-toggle" id="Resources_for_Current_Fellows_105_control" type="button" aria-label="Resources for Current Fellows submenu" aria-controls="Resources_for_Current_Fellows_105_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Resources_for_Current_Fellows_105_section" class="offcanvas__list" data-level="5" aria-labelledby="Resources_for_Current_Fellows_105_control"><li class="offcanvas__item noChildren firstInLevel lastInLevel"><a href='/stsci-research/fellowships/nasa-hubble-fellowship-program/resources-for-current-fellows/visa-and-benefits-information' class="offcanvas__section-link" >Visa and Benefits Information</a></li></ul></li><li class="offcanvas__item noChildren"><a href='/stsci-research/fellowships/nasa-hubble-fellowship-program/2024-nhfp-fellows' class="offcanvas__section-link" >2024 NHFP Fellows</a></li><li class="offcanvas__item noChildren"><a href='/stsci-research/fellowships/nasa-hubble-fellowship-program/2023-nhfp-fellows' class="offcanvas__section-link" >2023 NHFP Fellows</a></li><li class="offcanvas__item noChildren"><a href='/stsci-research/fellowships/nasa-hubble-fellowship-program/2022-nhfp-fellows' class="offcanvas__section-link" >2022 NHFP Fellows</a></li><li class="offcanvas__item noChildren"><a href='/stsci-research/fellowships/nasa-hubble-fellowship-program/2021-nhfp-fellows' class="offcanvas__section-link" >2021 NHFP Fellows</a></li><li class="offcanvas__item noChildren"><a href='/stsci-research/fellowships/nasa-hubble-fellowship-program/2020-nhfp-fellows' class="offcanvas__section-link" >2020 NHFP Fellows</a></li><li class="offcanvas__item noChildren"><a href='/stsci-research/fellowships/nasa-hubble-fellowship-program/2019-nhfp-fellows' class="offcanvas__section-link" >2019 NHFP Fellows</a></li><li class="offcanvas__item noChildren"><a href='/stsci-research/fellowships/nasa-hubble-fellowship-program/2018-nhfp-fellows' class="offcanvas__section-link" >2018 NHFP Fellows</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/stsci-research/fellowships/nasa-hubble-fellowship-program/2017-and-prior-fellows' class="offcanvas__section-link" >2017 and Prior Fellows</a></li></ul></li><li class="offcanvas__item noChildren"><a href='/stsci-research/fellowships/announcement-of-opportunity' class="offcanvas__section-link" >Announcement of Opportunity</a></li><li class="offcanvas__item noChildren"><a href='/stsci-research/fellowships/giacconi-fellowship' class="offcanvas__section-link" >Giacconi Fellowship</a></li><li class="offcanvas__item noChildren"><a href='/stsci-research/fellowships/lasker-fellowship' class="offcanvas__section-link" >Lasker Fellowship</a></li><li class="offcanvas__item noChildren"><a href='/stsci-research/fellowships/exoplanet-science-fellowship' class="offcanvas__section-link" >Exoplanet Science Fellowship</a></li><li class="offcanvas__item noChildren"><a href='/stsci-research/fellowships/stsci-postdoctoral-fellowship' class="offcanvas__section-link" >STScI Postdoctoral Fellowship</a></li><li class="offcanvas__item noChildren"><a href='/stsci-research/fellowships/davidsen-fellowship' class="offcanvas__section-link" >Davidsen Fellowship</a></li><li class="offcanvas__item hasChildren"><a href='/stsci-research/fellowships/brinson-prize-fellowship-program' class="offcanvas__section-link" >Brinson Prize Fellowship Program</a><button class="offcanvas__section-toggle" id="Brinson_Prize_Fellowship_Program_106_control" type="button" aria-label="Brinson Prize Fellowship Program submenu" aria-controls="Brinson_Prize_Fellowship_Program_106_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Brinson_Prize_Fellowship_Program_106_section" class="offcanvas__list" data-level="4" aria-labelledby="Brinson_Prize_Fellowship_Program_106_control"><li class="offcanvas__item noChildren firstInLevel lastInLevel"><a href='/stsci-research/fellowships/brinson-prize-fellowship-program/announcement-of-opportunity' class="offcanvas__section-link" >Announcement of Opportunity</a></li></ul></li><li class="offcanvas__item noChildren lastInLevel"><a href='/stsci-research/fellowships/current-and-past-fellows' class="offcanvas__section-link" >Current and Past Fellows</a></li></ul></li><li class="offcanvas__item hasChildren lastInLevel"><a href='/stsci-research/caroline-herschel-visitor-program' class="offcanvas__section-link" >Caroline Herschel Visitor Program</a><button class="offcanvas__section-toggle" id="Caroline_Herschel_Visitor_Program_107_control" type="button" aria-label="Caroline Herschel Visitor Program submenu" aria-controls="Caroline_Herschel_Visitor_Program_107_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Caroline_Herschel_Visitor_Program_107_section" class="offcanvas__list" data-level="3" aria-labelledby="Caroline_Herschel_Visitor_Program_107_control"><li class="offcanvas__item noChildren firstInLevel lastInLevel"><a href='/stsci-research/caroline-herschel-visitor-program/past-visitors' class="offcanvas__section-link" >Past Visitors</a></li></ul></li></ul></li><li class="offcanvas__item hasChildren"><a href='/news' class="offcanvas__section-link" >News Center</a><button class="offcanvas__section-toggle" id="News_Center_108_control" type="button" aria-label="News Center submenu" aria-controls="News_Center_108_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="News_Center_108_section" class="offcanvas__list" data-level="2" aria-labelledby="News_Center_108_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/news/press-releases' class="offcanvas__section-link" >Press Releases</a></li><li class="offcanvas__item noChildren"><a href='/news/journalist-resources' class="offcanvas__section-link" >Journalist Resources</a></li><li class="offcanvas__item noChildren"><a href='/news/scientist-resources' class="offcanvas__section-link" >Scientist Resources</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/news/newsletters' class="offcanvas__section-link" >Newsletters</a></li></ul></li><li class="offcanvas__item hasChildren"><a href='/events' class="offcanvas__section-link" >Events</a><button class="offcanvas__section-toggle" id="Events_109_control" type="button" aria-label="Events submenu" aria-controls="Events_109_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Events_109_section" class="offcanvas__list" data-level="2" aria-labelledby="Events_109_control"><li class="offcanvas__item hasChildren firstInLevel"><a href='/events/webcasts' class="offcanvas__section-link" >Webcasts</a><button class="offcanvas__section-toggle" id="Webcasts_110_control" type="button" aria-label="Webcasts submenu" aria-controls="Webcasts_110_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Webcasts_110_section" class="offcanvas__list" data-level="3" aria-labelledby="Webcasts_110_control"><li class="offcanvas__item noChildren firstInLevel lastInLevel"><a href='/events/webcasts/webcast-faqs' class="offcanvas__section-link" >Webcast FAQs</a></li></ul></li></ul></li><li class="offcanvas__item hasChildren"><a href='/communications-and-outreach' class="offcanvas__section-link" >Communications and Outreach</a><button class="offcanvas__section-toggle" id="Communications_and_Outreach_111_control" type="button" aria-label="Communications and Outreach submenu" aria-controls="Communications_and_Outreach_111_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Communications_and_Outreach_111_section" class="offcanvas__list" data-level="2" aria-labelledby="Communications_and_Outreach_111_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/communications-and-outreach/news-production' class="offcanvas__section-link" >News Production</a></li><li class="offcanvas__item noChildren"><a href='/communications-and-outreach/stem-learning' class="offcanvas__section-link" >STEM Learning</a></li><li class="offcanvas__item hasChildren lastInLevel"><a href='/communications-and-outreach/public-outreach' class="offcanvas__section-link" >Public Outreach</a><button class="offcanvas__section-toggle" id="Public_Outreach_112_control" type="button" aria-label="Public Outreach submenu" aria-controls="Public_Outreach_112_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Public_Outreach_112_section" class="offcanvas__list" data-level="3" aria-labelledby="Public_Outreach_112_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/communications-and-outreach/public-outreach/public-lecture-series' class="offcanvas__section-link" >Public Lecture Series</a></li></ul></li></ul></li><li class="offcanvas__item hasChildren"><a href='/opportunities' class="offcanvas__section-link" >Opportunities</a><button class="offcanvas__section-toggle" id="Opportunities_113_control" type="button" aria-label="Opportunities submenu" aria-controls="Opportunities_113_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Opportunities_113_section" class="offcanvas__list" data-level="2" aria-labelledby="Opportunities_113_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/opportunities/how-to-apply' class="offcanvas__section-link" >How to Apply</a></li><li class="offcanvas__item noChildren"><a href='/opportunities/benefits' class="offcanvas__section-link" >Benefits</a></li><li class="offcanvas__item noChildren"><a href='/opportunities/our-work' class="offcanvas__section-link" >Our Work</a></li><li class="offcanvas__item hasChildren lastInLevel"><a href='/opportunities/space-astronomy-summer-program' class="offcanvas__section-link" >Space Astronomy Summer Program</a><button class="offcanvas__section-toggle" id="Space_Astronomy_Summer_Program_114_control" type="button" aria-label="Space Astronomy Summer Program submenu" aria-controls="Space_Astronomy_Summer_Program_114_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Space_Astronomy_Summer_Program_114_section" class="offcanvas__list" data-level="3" aria-labelledby="Space_Astronomy_Summer_Program_114_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/opportunities/space-astronomy-summer-program/program-details' class="offcanvas__section-link" >Program Details</a></li><li class="offcanvas__item noChildren"><a href='/opportunities/space-astronomy-summer-program/application-information' class="offcanvas__section-link" >Application Information</a></li><li class="offcanvas__item noChildren"><a href='/opportunities/space-astronomy-summer-program/housing-and-transportation' class="offcanvas__section-link" >Housing and Transportation</a></li><li class="offcanvas__item noChildren"><a href='/opportunities/space-astronomy-summer-program/working-at-the-institute' class="offcanvas__section-link" >Working at the Institute</a></li><li class="offcanvas__item noChildren"><a href='/opportunities/space-astronomy-summer-program/frequently-asked-questions' class="offcanvas__section-link" >Frequently Asked Questions</a></li><li class="offcanvas__item noChildren lastInLevel"><a href='/opportunities/space-astronomy-summer-program/archived-student-presentations' class="offcanvas__section-link" >Archived Student Presentations</a></li></ul></li></ul></li><li class="offcanvas__item hasChildren"><a href='/contact' class="offcanvas__section-link" >Contact Us</a><button class="offcanvas__section-toggle" id="Contact_Us_115_control" type="button" aria-label="Contact Us submenu" aria-controls="Contact_Us_115_section" tabindex="-1" aria-expanded="false"><span class="svg-sprite -plus"><svg role="img" aria-label="open section"><use xlink:href="#plus"></use></svg></span><span class="svg-sprite -slider-dash"><svg role="img" aria-label="close section"><use xlink:href="#slider-dash"></use></svg></span></button><ul role="list" id="Contact_Us_115_section" class="offcanvas__list" data-level="2" aria-labelledby="Contact_Us_115_control"><li class="offcanvas__item noChildren firstInLevel"><a href='/contact/local-information' class="offcanvas__section-link" >Local Information</a></li><li class="offcanvas__item noChildren"><a href='/contact/getting-here' class="offcanvas__section-link" >Getting Here</a></li></ul></li></ul></div> </nav> <div class="offcanvas-body"> <section id="top-of-page"> <main id="main-content" class=" " > <div class="background-img banner__interior " aria-labelledby="page-title" > <div class="row banner__content"> <div class="col-md-12 text-center"> <h1 id="page-title" class="interior-page-title ">Calibration Tools</h1> </div> </div> <picture class="stretch-container"><img alt="Hubble Space Telescope over combined infrared and visible views of Mystic Mountain" src="/files/live/sites/www/files/home/hst/_images/HST-SectionBanner-001.jpg?t=tn370" srcset="/files/live/sites/www/files/home/hst/_images/HST-SectionBanner-001.jpg?t=tn370 370w, /files/live/sites/www/files/home/hst/_images/HST-SectionBanner-001.jpg?t=tn768 768w, /files/live/sites/www/files/home/hst/_images/HST-SectionBanner-001.jpg?t=tn992 992w, /files/live/sites/www/files/home/hst/_images/HST-SectionBanner-001.jpg?t=tn1200 1200w, /files/live/sites/www/files/home/hst/_images/HST-SectionBanner-001.jpg?t=tn1600 1600w, /files/live/sites/www/files/home/hst/_images/HST-SectionBanner-001.jpg?t=tn2400 2400w" sizes="100vw" /></picture><noscript><img alt="Hubble Space Telescope over combined infrared and visible views of Mystic Mountain" class="noscript-img null" src="/files/live/sites/www/files/home/hst/_images/HST-SectionBanner-001.jpg?t=tn370" srcset="/files/live/sites/www/files/home/hst/_images/HST-SectionBanner-001.jpg?t=tn370 370w, /files/live/sites/www/files/home/hst/_images/HST-SectionBanner-001.jpg?t=tn768 768w, /files/live/sites/www/files/home/hst/_images/HST-SectionBanner-001.jpg?t=tn992 992w, /files/live/sites/www/files/home/hst/_images/HST-SectionBanner-001.jpg?t=tn1200 1200w, /files/live/sites/www/files/home/hst/_images/HST-SectionBanner-001.jpg?t=tn1600 1600w, /files/live/sites/www/files/home/hst/_images/HST-SectionBanner-001.jpg?t=tn2400 2400w" sizes="100vw" /></noscript></div> <div class="mission-nav content-section-2" data-module-dynamic="mission-nav"> <div class="container-fluid"> <nav aria-labelledby="h2-mission-nav" > <h2 id="h2-mission-nav" class="sr-only">HST Menu</h2> <ul role="list"> <div class="nav-items-wrapper-start"></div> <li class="js-first-level"> <a href="/hst" >HST Home</a> </li><li class="js-first-level"> <a href="/hst/about" >About</a> <div class="mission-nav__dropdown"> <ul role="list"> <li class=""> <a href="/hst/about/key-science-themes" >Key Science Themes</a> </li><li class=""> <a href="/hst/about/hst-scorecard" class="noChildren">HST Scorecard</a> </li><li class=""> <a href="https://hubblesite.org/mission-and-telescope/mission-timeline" class="noChildren">History</a> </li><li class=""> <a href="/hst/about/key-individuals" class="noChildren">Key Individuals</a> </li><li class=""> <a href="/hst/about/space-telescope-users-committee" >Space Telescope Users Committee</a> </li></ul> </div> </li><li class="js-first-level"> <a href="/hst/proposing" >Proposing</a> <div class="mission-nav__dropdown"> <ul role="list"> <li class=""> <a href="/hst/proposing/phase-i" >Phase I</a> </li><li class=""> <a href="/hst/proposing/phase-ii" >Phase II</a> </li><li class=""> <a href="/hst/proposing/approved-programs" >Approved Programs</a> </li></ul> </div> </li><li class="js-first-level"> <a href="/hst/observing" >Observing</a> <div class="mission-nav__dropdown"> <ul role="list"> <li class=""> <a href="/hst/observing/scheduling" class="noChildren">Scheduling</a> </li><li class=""> <a href="/hst/observing/activating-your-target-of-opportunity" class="noChildren">Activating Your Target of Opportunity</a> </li><li class=""> <a href="/hst/observing/observing-status" class="noChildren">Observing Status</a> </li><li class=""> <a href="/hst/observing/program-information" class="noChildren">Program Information</a> </li><li class=""> <a href="/hst/observing/post-observation" >Post-Observation</a> </li></ul> </div> </li><li class="js-first-level current-section"> <a href="/hst/instrumentation" aria-current='page'>Instrumentation</a> <div class="mission-nav__dropdown"> <ul role="list"> <li class=" current-section"> <a href="/hst/instrumentation/acs" aria-current='page'>Advanced Camera for Surveys</a> </li><li class=""> <a href="/hst/instrumentation/cos" >Cosmic Origins Spectrograph</a> </li><li class=""> <a href="/hst/instrumentation/fgs" >Fine Guidance Sensors</a> </li><li class=""> <a href="/hst/instrumentation/stis" >Space Telescope Imaging Spectrograph</a> </li><li class=""> <a href="/hst/instrumentation/wfc3" >Wide Field Camera 3</a> </li><li class=""> <a href="/hst/instrumentation/focus-and-pointing" >Focus and Pointing</a> </li><li class=""> <a href="/hst/instrumentation/legacy" >Legacy Instruments</a> </li><li class=""> <a href="/hst/instrumentation/reference-data-for-calibration-and-tools" >Reference Data for Calibration and Tools</a> </li></ul> </div> </li><li class="js-first-level"> <a href="/hst/documentation" >Documentation</a> <div class="mission-nav__dropdown"> <ul role="list"> <li class=""> <a href="/hst/documentation/handbook-archive" class="noChildren">Handbook Archive</a> </li></ul> </div> </li><li class="js-first-level"> <a href="/hst/news-and-events" >News & Events</a> <div class="mission-nav__dropdown"> <ul role="list"> <li class=""> <a href="/hst/news-and-events/news" class="noChildren">News</a> </li><li class=""> <a href="/hst/news-and-events/articles" class="noChildren">Articles</a> </li><li class=""> <a href="/events" class="noChildren">Events</a> </li><li class=""> <a href="https://hubblesite.org/news/news-releases" class="noChildren">Press</a> </li></ul> </div> </li><div class="nav-items-wrapper-end"></div> </ul> </nav> </div> </div><div class="container-fluid breadcrumbs-container"> <nav class="breadcrumbs-share row hidden-xs hidden-sm" aria-label="Breadcrumb" data-module-dynamic="toggle-links-display"> <div class="col-sm-12"> <h2 id="h2-sr-only-breadcrumbs-navigation" class="sr-only">Breadcrumbs Navigation</h2> <ul role="list" class="breadcrumbs"> <li class="breadcrumb"> <a href="/home"> <span>Home</span></a> </li> <li class="breadcrumb"> <button class="breadcrumbs-share__expander" type="button" aria-label="Hidden Breadcrumbs" aria-expanded="false" aria-controls="hidden-breadcrumbs"> <span class="dot"></span> <span class="dot"></span> <span class="dot"></span> <span>(+)</span> </button> <div class="breadcrumbs-share__hidden-items-wrapper"> <ul role="list" id="hidden-breadcrumbs" class="breadcrumbs-share__hidden-items"> <li class="breadcrumb"> <a href="/hst"> <span>Hubble Space Telescope</span></a> </li> <li class="breadcrumb"> <a href="/hst/instrumentation"> <span>Instrumentation</span></a> </li> </ul> </div> </li> <li class="breadcrumb"> <a href="/hst/instrumentation/acs"> <span>Advanced Camera for Surveys</span></a> </li> <li class="breadcrumb"> <a href="/hst/instrumentation/acs/software-tools"> <span>Software Tools</span></a> </li> </ul> </div> </nav> </div><div class="main"> <section id="section-d3a921f0-4355-4ef4-8d0d-2166948086bd" data-name="section-introduction" class="section-row none" > <h2 id="h2-sr-only-0c3efb08-eca7-499a-87d9-869137aec57b" data-name="h2-sr-only-introduction" class="sr-only" data-include-in-navigation="false"> Introduction</h2> <nav class="on-this-page-wrapper" aria-labelledby="p-44f0c6a7-5c29-4986-9c79-90c1e30d7cbc"> <div class="on-this-page section-separate"> <div class="row"> <div class="col-xs-12"> <div class="dropdown" data-module-dynamic="dropdown-mobile"> <p id="p-44f0c6a7-5c29-4986-9c79-90c1e30d7cbc" data-name="p-on-this-page" class="h4">On This Page</p> <button class="btn visible-xs-inline-block" id="pageNavButton" data-toggle="dropdown" aria-expanded="false"> <span class="btn-text">On This Page</span> <span class="svg-sprite -carat"> <svg aria-hidden="true" focusable="false"> <use xlink:href="#carat"></use> </svg> </span> </button> <ul role="list"> </ul> </div> </div> </div> </div> </nav><div class="component-block container-fluid"> <p>Updates made to the ACS calibration pipeline, <code>CALACS</code>, are documented here. Several times a year, updates to the software packages in the HST calibration pipelines (HSTCAL) are released in an HST data processing (HSTDP) build (e.g. HSTDP 2018.1). After each build is released, the HSTCAL package is available to the science community on <a href="https://anaconda.org/conda-forge/hstcal/files">conda-forge</a>.</p> <script>hljs.initHighlightingOnLoad();</script> </div></section><section id="section-a1d349d2-13ab-46c9-89db-c9a12d9df356" data-name="section-latest-updates" class="section-row none" > <div class="component-block container-fluid"> <div class="row"> <div class="section-header col-xs-12 text-left"> <h2 id="h2-bf6c6104-4160-44f2-a698-80fa93795d27" data-name="h2-latest-updates" class="section-header__title" data-include-in-navigation="true"> Latest Updates</h2> </div> </div> </div> <div class="component-block container-fluid"> <h3 data-index="0" data-name="h4-current-version-information" id="h4-CK-cb970819-1e67-4ecf-afe9-84fc8fa73894">Current Version Information</h3> <p><code>ACSTOOLS</code> version: 3.7.2</p> <p><code>HSTCAL</code> version: 3.1.0</p> <p style="margin-left: 40px;"><code>CALACS</code> version: 10.4.0</p> <script>hljs.initHighlightingOnLoad();</script> </div><div class="component-block container-fluid"> <div class="accordion" data-module-dynamic="accordion"> <h3 id="accordion-2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6" >Build Information</h3> <div class="sr-only" aria-live="polite" aria-atomic="true"></div> <div class="accordion__controls"> <button type="button" class="accordion__control" aria-label="Expand All Build Information Panels" data-accordion-button="expand-all">Expand All</button> <span class="accordion__controls-divider"></span> <button type="button" class="accordion__control" aria-label="Collapse All Build Information Panels" data-accordion-button="collapse-all">Collapse All</button> </div> <ul role="list" aria-labelledby="accordion-2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6"> <li> <div class="accordion-container panel"> <h4 id="h4-16b32872-9f44-4950-b1de-82560e8002ba" data-name="h4-hstdp-2022-1-0" class="accordion-header"> <button class="accordion__section-toggle collapsed accordion-header" id="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_0_control" data-toggle="collapse" type="button" aria-label="HSTDP 2022.1.0 Navigation Section" aria-controls="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_0_section" data-target="#tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_0_section" tabindex="0" aria-expanded="false"> <span class="accordion__title-text">HSTDP 2022.1.0</span> </button> </h4> <div class="accordion__content collapse " aria-expanded="false" id="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_0_section" aria-labelledby="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_0_control"> <div class="accordion__content-inner light-background-"> <div><ul class="bulleted"> <li> <p>CALACS updated to Version 10.3.5.</p> </li> <li> <p>Update to the cosmic ray rejection algorithm of CALACS as to the way the output ERR extension is computed for the CRJ/CRC file. The output ERR is now propagated from the usable input ERR extensions versus being computed by a model.</p> </li> <li> <p>Modified CALACS to ensure the ERR extension of the CRC/CRJ file is always a two-dimensional image, even if the entire image could be represented by a single value. This change was triggered by ACS Instrument Team testing and to avoid possible confusion by users.</p> </li> </ul> </div> </div> </div> </div></li> <li> <div class="accordion-container panel"> <h4 id="h4-d885805c-f259-4518-95e1-982841dbb548" data-name="h4-conda-forge-distribution" class="accordion-header"> <button class="accordion__section-toggle collapsed accordion-header" id="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_1_control" data-toggle="collapse" type="button" aria-label="conda-forge Distribution Navigation Section" aria-controls="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_1_section" data-target="#tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_1_section" tabindex="0" aria-expanded="false"> <span class="accordion__title-text">conda-forge Distribution</span> </button> </h4> <div class="accordion__content collapse " aria-expanded="false" id="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_1_section" aria-labelledby="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_1_control"> <div class="accordion__content-inner light-background-"> <div><ul class="bulleted"> <li> <p>HSTCAL v2.7.3 standalone is distributed by <a href="https://anaconda.org/conda-forge/hstcal/files" target="_blank">conda-forge</a>.</p> </li> <li> <p>CALACS updated to Version 10.3.4.</p> </li> <li> <p>Modifications to resolve an issue seen only when the executables were compiled under the new conda-forge system. These changes included some modest clean-up.</p> </li> </ul> </div> </div> </div> </div></li> <li> <div class="accordion-container panel"> <h4 id="h4-2d5b5cbd-ce38-4a8e-9886-1cdb1ffdb008" data-name="h4-hstdp-2021-3-3" class="accordion-header"> <button class="accordion__section-toggle collapsed accordion-header" id="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_2_control" data-toggle="collapse" type="button" aria-label="HSTDP 2021.3.3 Navigation Section" aria-controls="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_2_section" data-target="#tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_2_section" tabindex="0" aria-expanded="false"> <span class="accordion__title-text">HSTDP 2021.3.3</span> </button> </h4> <div class="accordion__content collapse " aria-expanded="false" id="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_2_section" aria-labelledby="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_2_control"> <div class="accordion__content-inner light-background-"> <div><ul class="bulleted"> <li> <p>CALACS updated to Version 10.3.3.</p> </li> <li> <p>Fixed a bug associated with the FLASHDUR computation. The FLASHDUR keyword has been updated in the CRJ/CRC headers to be the sum of the individual input images as this keyword is used in ACS2D to scale the flash reference file for flash correction.</p> </li> <li> <p>Fixed a bug associated with the DARKTIME computation. Code written for CALACS 10.2.2 has been moved from ACS2D to ACSCCD so every BLV_TMP file has the correct DARKTIME keyword value. Also, the DARKTIME keyword has been updated in the CRJ/CRC headers to be the sum of the individual input images. Only the DARKTIME value in the input file header is used to scale the dark reference file for the dark correction.</p> </li> </ul> </div> </div> </div> </div></li> <li> <div class="accordion-container panel"> <h4 id="h4-b2df970f-f5fa-4b50-a4c5-74665489b41c" data-name="h4-hstdp-2021-3-1" class="accordion-header"> <button class="accordion__section-toggle collapsed accordion-header" id="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_3_control" data-toggle="collapse" type="button" aria-label="HSTDP 2021.3.1 Navigation Section" aria-controls="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_3_section" data-target="#tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_3_section" tabindex="0" aria-expanded="false"> <span class="accordion__title-text">HSTDP 2021.3.1</span> </button> </h4> <div class="accordion__content collapse " aria-expanded="false" id="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_3_section" aria-labelledby="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_3_control"> <div class="accordion__content-inner light-background-"> <div><ul class="bulleted"> <li> <p>CALACS updated to Version 10.3.2.</p> </li> <li> <p>Reverted the name of the ACS forward model executable back to "acscteforwardmodel.e" from "acsforwardmodel.e" to mitigate documentation and script issues. The name was inadvertently changed when code was reorganized to resolve circular references. This update does <em>NOT</em> affect the calibration pipeline processing of data nor any data in the archive.</p> </li> </ul> </div> </div> </div> </div></li> <li> <div class="accordion-container panel"> <h4 id="h4-6699ea49-e899-4b7a-a720-3c2da4d352a5" data-name="h4-hstdp-2021-2-0" class="accordion-header"> <button class="accordion__section-toggle collapsed accordion-header" id="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_4_control" data-toggle="collapse" type="button" aria-label="HSTDP 2021.2.0 Navigation Section" aria-controls="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_4_section" data-target="#tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_4_section" tabindex="0" aria-expanded="false"> <span class="accordion__title-text">HSTDP 2021.2.0</span> </button> </h4> <div class="accordion__content collapse " aria-expanded="false" id="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_4_section" aria-labelledby="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_4_control"> <div class="accordion__content-inner light-background-"> <div><ul class="bulleted"> <li> <p>CALACS updated to Version 10.3.1.</p> </li> <li>Fixed a bug which specifically was only an issue when trying to run "acscte.e" or "acsforwardmodel.e" as<br /> standalone components. These two executables would generate a SegFault. This problem did NOT affect<br /> the calibration pipeline processing (i.e., CALACS).</li> </ul> </div> </div> </div> </div></li> <li> <div class="accordion-container panel"> <h4 id="h4-dc223509-f280-4fdc-9e78-9d77bded3c62" data-name="h4-hstdp-2021-1-0" class="accordion-header"> <button class="accordion__section-toggle collapsed accordion-header" id="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_5_control" data-toggle="collapse" type="button" aria-label="HSTDP 2021.1.0 Navigation Section" aria-controls="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_5_section" data-target="#tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_5_section" tabindex="0" aria-expanded="false"> <span class="accordion__title-text">HSTDP 2021.1.0</span> </button> </h4> <div class="accordion__content collapse " aria-expanded="false" id="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_5_section" aria-labelledby="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_5_control"> <div class="accordion__content-inner light-background-"> <div><ul class="bulleted"> <li> <p>CALACS updated to Version 10.3.0.</p> </li> <li>Implementation to use a full two-dimensional image to detect and flag full-well saturation values in the science data versus a simple single scalar as used previously. The detection/flagging occurs after bias correction, conversion to electrons, and blev correction.</li> </ul> </div> </div> </div> </div></li> <li> <div class="accordion-container panel"> <h4 id="h4-da78ea51-ffdb-44a3-89da-bc590dfbc6b7" data-name="h4-hstdp-2020-3-1" class="accordion-header"> <button class="accordion__section-toggle collapsed accordion-header" id="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_6_control" data-toggle="collapse" type="button" aria-label="HSTDP 2020.3.1 Navigation Section" aria-controls="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_6_section" data-target="#tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_6_section" tabindex="0" aria-expanded="false"> <span class="accordion__title-text">HSTDP 2020.3.1</span> </button> </h4> <div class="accordion__content collapse " aria-expanded="false" id="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_6_section" aria-labelledby="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_6_control"> <div class="accordion__content-inner light-background-"> <div><ul class="bulleted"> <li> <p>CALACS updated to Version 10.2.4.</p> </li> <li> <p>Removed residue sort routine.</p> </li> <li> <p>Addresses issues associated with routines under copyright.</p> </li> </ul> </div> </div> </div> </div></li> <li> <div class="accordion-container panel"> <h4 id="h4-d3400117-d5cf-4681-870e-1e1513ff6165" data-name="h4-hstdp-2020-3-0" class="accordion-header"> <button class="accordion__section-toggle collapsed accordion-header" id="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_7_control" data-toggle="collapse" type="button" aria-label="HSTDP 2020.3.0 Navigation Section" aria-controls="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_7_section" data-target="#tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_7_section" tabindex="0" aria-expanded="false"> <span class="accordion__title-text">HSTDP 2020.3.0</span> </button> </h4> <div class="accordion__content collapse " aria-expanded="false" id="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_7_section" aria-labelledby="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_7_control"> <div class="accordion__content-inner light-background-"> <div><ul class="bulleted"> <li> <p>CALACS updated to Version 10.2.3</p> </li> <li> <p>The A-to-D saturation threshold is no longer a hard-coded constant value. A threshold value appropriate for the input raw data (matching in chip number, amp, gain, and offset) is now read from the CCDTAB reference file.</p> </li> </ul> </div> </div> </div> </div></li> <li> <div class="accordion-container panel"> <h4 id="h4-843de3c4-0552-4168-b431-1552414aca32" data-name="h4-hstdp-2020-1-0" class="accordion-header"> <button class="accordion__section-toggle collapsed accordion-header" id="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_8_control" data-toggle="collapse" type="button" aria-label="HSTDP 2020.1.0 Navigation Section" aria-controls="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_8_section" data-target="#tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_8_section" tabindex="0" aria-expanded="false"> <span class="accordion__title-text">HSTDP 2020.1.0</span> </button> </h4> <div class="accordion__content collapse " aria-expanded="false" id="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_8_section" aria-labelledby="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_8_control"> <div class="accordion__content-inner light-background-"> <div><ul class="bulleted"> <li> <p>CALACS updated to Version 10.2.2.</p> </li> <li> <p>In the DARKCORR step of CALACS, the value of the DARKTIME keyword is used to account for time that dark current accumulates. It has been determined that depending upon the type of WFC observation (i.e., full frame or subarray, post-flash or no post-flash) there is an additional correction needed. The additional correction values need to be read from updated CCDTAB reference files, and correspondingly, the DARKCORR algorithm has been updated to accommodate new logic for applying the correction.</p> </li> </ul> </div> </div> </div> </div></li> <li> <div class="accordion-container panel"> <h4 id="h4-f46fe81e-68f6-4f3d-adc0-a0447aa1c1ad" data-name="h4-hstdp-2019-4" class="accordion-header"> <button class="accordion__section-toggle collapsed accordion-header" id="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_9_control" data-toggle="collapse" type="button" aria-label="HSTDP 2019.4 Navigation Section" aria-controls="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_9_section" data-target="#tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_9_section" tabindex="0" aria-expanded="false"> <span class="accordion__title-text">HSTDP 2019.4</span> </button> </h4> <div class="accordion__content collapse " aria-expanded="false" id="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_9_section" aria-labelledby="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_9_control"> <div class="accordion__content-inner light-background-"> <div><ul class="bulleted"> <li> <p>CALACS updated to Version 10.2.1.</p> </li> <li> <p>CALACS has been modified to allow the FITS PHOTMODE keyword to be updated with the MJD for the SBC, in addition to the HRC and WFC. This will allow time-dependent sensitivity to be applied properly to SBC.</p> </li> </ul> </div> </div> </div> </div></li> <li> <div class="accordion-container panel"> <h4 id="h4-b9237f71-3ff8-4c04-8c69-7616a221b5a6" data-name="h4-hstdp-2019-3b" class="accordion-header"> <button class="accordion__section-toggle collapsed accordion-header" id="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_10_control" data-toggle="collapse" type="button" aria-label="HSTDP 2019.3b Navigation Section" aria-controls="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_10_section" data-target="#tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_10_section" tabindex="0" aria-expanded="false"> <span class="accordion__title-text">HSTDP 2019.3b</span> </button> </h4> <div class="accordion__content collapse " aria-expanded="false" id="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_10_section" aria-labelledby="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_10_control"> <div class="accordion__content-inner light-background-"> <div><ul class="bulleted" role="list"> <li> <p>CALACS updated to Version 10.2.0.</p> </li> <li> <p>For bias or dark images, ACSREJ ignores the bad pixels (BPIXTAB flag of 4) during the combination process for the SCI and ERR arrays (i.e. treat bad pixels as normal pixels).</p> </li> </ul> </div> </div> </div> </div></li> <li> <div class="accordion-container panel"> <h4 id="h4-138910d3-c2b4-458e-baa9-4f26ce43bdd1" data-name="h4-hstdp-2018-3" class="accordion-header"> <button class="accordion__section-toggle collapsed accordion-header" id="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_11_control" data-toggle="collapse" type="button" aria-label="HSTDP 2018.3 Navigation Section" aria-controls="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_11_section" data-target="#tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_11_section" tabindex="0" aria-expanded="false"> <span class="accordion__title-text">HSTDP 2018.3</span> </button> </h4> <div class="accordion__content collapse " aria-expanded="false" id="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_11_section" aria-labelledby="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_11_control"> <div class="accordion__content-inner light-background-"> <div><ul class="bulleted"> <li> <p>CALACS updates to Version 10.1.0 due to updates in the ACSCCD and ACS2D algorithms.</p> </li> <li> <p>The dark correction, DARKCORR step of the ACS2D algorithm, has been modified to work directly on the full 2D data rather than on a line-by-line basis.</p> </li> <li> <p>The bias shift correction, BLEVCORR step of the ACSCCD algorithm, has been upgraded to accommodate the new supported subarrays which have both physical and virtual overscan. This is the same algorithm which applies to full frame data.</p> </li> <li> <p>Forward model functionality was implemented which exploits the existing CTE code and usage (Generation 2 only). Instead of correcting the CTE trails, the forward model functionality simulates (adds) the trails. This functionality should be accessed via the new ACSTOOLS function, acscteforwardmodel.py</p> </li> <li> <p>Updated ACS library routine, getacskeys, updated to call the new HSTIO function which robustly determines the number of IMSETS in a FITS file.</p> </li> </ul> </div> </div> </div> </div></li> <li> <div class="accordion-container panel"> <h4 id="h4-693d0da6-52f1-4d0a-9c6f-4edd32624bb9" data-name="h4-hstdp-2018-1" class="accordion-header"> <button class="accordion__section-toggle collapsed accordion-header" id="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_12_control" data-toggle="collapse" type="button" aria-label="HSTDP 2018.1 Navigation Section" aria-controls="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_12_section" data-target="#tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_12_section" tabindex="0" aria-expanded="false"> <span class="accordion__title-text">HSTDP 2018.1</span> </button> </h4> <div class="accordion__content collapse " aria-expanded="false" id="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_12_section" aria-labelledby="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_12_control"> <div class="accordion__content-inner light-background-"> <div><ul class="bulleted"> <li> <p>CALACS updates to Version 10.0.0 due to the modifications imposed by the upgraded ACSREJ algorithm.</p> </li> <li> <p>An updated ACSREJ algorithm was implemented where all calculations are now done in electrons versus DN. The threshold computation uses the ERR arrays to account for post-flash noise. The C interface to the ACSREJ standalone component of CALACS was modified for clarity. Specifically, the "newbias" option was renamed "readnoise_only". The functionality associated with this option remains the same. For more information see <a href="/files/live/sites/www/files/home/hst/instrumentation/acs/documentation/instrument-science-reports-isrs/_documents/isr1805.pdf" title="isr1805.pdf">ACS ISR 2018-05</a>.</p> </li> <li> <p>CALACS now uses the amp-dependent read noise as the threshold to determine if a pixel has enough signal-to-noise ratio such that a reasonable CTE correction can be applied.</p> </li> <li> <p>A bug fix has been implemented which is only applicable for RAWs with PCTECORR=PERFORM for ASNs used for cosmic ray rejection. In this case the CR rejected output (CRJ) previously used the wrong dark; it used the CTE-corrected dark. This has been addressed, and the CRJ product is now correct utilizing the non-CTE corrected dark.</p> </li> <li> <p>All BIAS files are now processed by CALACS to use only read noise (vs Poisson) for the computation of the ERR array as the date discriminant (pre- and post-SM4) has been removed.</p> </li> </ul> </div> </div> </div> </div></li> <li> <div class="accordion-container panel"> <h4 id="h4-a4d204f9-c551-4d9a-a867-a11974f4c1af" data-name="h4-hstdp-2017-2a" class="accordion-header"> <button class="accordion__section-toggle collapsed accordion-header" id="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_13_control" data-toggle="collapse" type="button" aria-label="HSTDP 2017.2A Navigation Section" aria-controls="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_13_section" data-target="#tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_13_section" tabindex="0" aria-expanded="false"> <span class="accordion__title-text">HSTDP 2017.2A</span> </button> </h4> <div class="accordion__content collapse " aria-expanded="false" id="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_13_section" aria-labelledby="tab_2391b2f3-a14a-4f0a-b6ca-9b7d0fea6de6_13_control"> <div class="accordion__content-inner light-background-"> <div><ul class="bulleted"> <li> <p>CALACS updates to version 9.2.0 with this release.</p> </li> <li> <p>New BLEVCORR algorithm that uses new OSCNTAB, which now correctly calculates bias level for AMP B and D in subarrays.</p> </li> <li> <p>New SINKCORR step to apply new SNKCFILE in order to flag sink pixels. For information about the SINKCORR step see <a href="/files/live/sites/www/files/home/hst/instrumentation/acs/documentation/instrument-science-reports-isrs/_documents/isr1701.pdf" rel="nofollow" title="isr1701.pdf">ACS ISR 2017-01</a>.</p> </li> <li> <p>New pixel based PCTECORR algorithm implemented (<code>CTE_NAME= 'PixelCTE 2017'</code>).</p> <ul class="bulleted"> <li>The code defaults to this new algorithm, however, the old one can still be executed using the command line option <code>--ctegen <1|2></code>. <em>Note: The correct accompanying PCTETAB file must also be used.</em></li> <li>The user can now override the PCTETAB file used (normally specified in the image header) with the command line option <code>--pctetab <file path></code>.</li> <li>The number of threads used for computing the PCTECORR can now be specified with the command line option <code>--nthreads <N></code>. <em>Note: OPENMP is required for N > 1.</em></li> </ul> </li> <li> <p>Fixed uninitialized variable in <code>prinfo.c</code>.</p> </li> <li> <p>Corrected <code>--version</code> reporting and added <code>-r</code> to report version string that was previously reported by <code>--version</code>.</p> </li> </ul> </div> </div> </div> </div></li> </ul> </div> </div></section><section id="section-7d70c566-954d-4d4c-a5cd-fd3855057b0e" data-name="section-overview-of-calacs" class="section-row none" > <div class="component-block container-fluid"> <div class="row"> <div class="section-header col-xs-12 text-left"> <h2 id="h2-de612d35-7875-4bc0-a791-356095d0c904" data-name="h2-overview-of-calacs" class="section-header__title" data-include-in-navigation="true"> Overview of CALACS</h2> </div> </div> </div> <div class="component-block container-fluid"> <p>The ACS calibration pipeline, CALACS, is divided up into five main tasks that are run sequentially. In order, these five tasks are: <strong>acsccd</strong>, <strong>acscte</strong>, <strong>acsrej</strong>, <strong>acs2d</strong>, <strong>acssum</strong>. The exact path an image takes through the pipeline is controlled by various switches stored in the image's primary header. In the boxes below, we describe each of the processing steps applied in the five main tasks and the relevant header switches that control them. For a complete description of each of these tasks, we refer users to the <a href="https://hst-docs.stsci.edu/acsdhb" target="_blank">ACS Data Handbook</a>.</p> <script>hljs.initHighlightingOnLoad();</script> </div><div class="component-block container-fluid"> <div class="accordion" data-module-dynamic="accordion"> <h3 id="accordion-8727bf85-630b-491e-bb28-55e145075fdc" class="sr-only">Calibration pipeline tasks</h3> <div class="sr-only" aria-live="polite" aria-atomic="true"></div> <div class="accordion__controls"> <button type="button" class="accordion__control" aria-label="Expand All Calibration pipeline tasks Panels" data-accordion-button="expand-all">Expand All</button> <span class="accordion__controls-divider"></span> <button type="button" class="accordion__control" aria-label="Collapse All Calibration pipeline tasks Panels" data-accordion-button="collapse-all">Collapse All</button> </div> <ul role="list" aria-labelledby="accordion-8727bf85-630b-491e-bb28-55e145075fdc"> <li> <div class="accordion-container panel"> <h4 id="h4-c40dba04-cad2-4f39-abfd-8c854b544a04" data-name="h4-acsccd" class="accordion-header"> <button class="accordion__section-toggle collapsed accordion-header" id="tab_8727bf85-630b-491e-bb28-55e145075fdc_0_control" data-toggle="collapse" type="button" aria-label="acsccd Navigation Section" aria-controls="tab_8727bf85-630b-491e-bb28-55e145075fdc_0_section" data-target="#tab_8727bf85-630b-491e-bb28-55e145075fdc_0_section" tabindex="0" aria-expanded="false"> <span class="accordion__title-text">acsccd</span> </button> </h4> <div class="accordion__content collapse " aria-expanded="false" id="tab_8727bf85-630b-491e-bb28-55e145075fdc_0_section" aria-labelledby="tab_8727bf85-630b-491e-bb28-55e145075fdc_0_control"> <div class="accordion__content-inner light-background-"> <div><p>This task contains the initial processing functions for all ACS CCD data.</p> <table data-module-dynamic="data-table" class="sortable-table filterable-table js-data-table display" data-b-sort="false" data-columns="[null,null,null]" data-dom="l<"sortable-table__toolbar"<"container-fluid">f><"sortable-table__wrapper"rt>ip" data-order="[]" data-searching="false" style="width:100%;"> <thead> <tr> <th data-datatable-hidden="false" data-datatable-sorting-direction="" data-datatable-sorting-order="" scope="col" style="width: 595px; text-align: center;">Function Name</th> <th data-datatable-hidden="false" data-datatable-sorting-direction="" data-datatable-sorting-order="" scope="col" style="width: 514px; text-align: center;">Header Switch</th> <th data-datatable-hidden="false" data-datatable-sorting-direction="" data-datatable-sorting-order="" scope="col" style="width: 829px; text-align: center;">Action Applied</th> </tr> </thead> <tbody> <tr> <td style="width: 595px; text-align: center;"><em><strong>doDQI</strong></em></td> <td style="width: 514px;"> <pre style="text-align: center;"> DQICORR</pre> </td> <td style="width: 829px;">Initializes the data quality (DQ) array by combining it with a table of known permenant bad pixels marked in the bad pixel table reference file.</td> </tr> <tr> <td style="width: 595px;"> <p style="text-align: center;"><em><strong>doBias</strong></em></p> </td> <td style="width: 514px;"> <pre style="text-align: center;"> BIASCORR</pre> </td> <td style="width: 829px;">Subtracts the superbias reference file to remove the low order, quasi-static structure of the bias, including the bias gradient in post-SM4 images</td> </tr> <tr> <td style="width: 595px; text-align: center;"><em><strong>toElectrons</strong></em></td> <td style="width: 514px; text-align: center;">NONE, applied to all CCD data</td> <td style="width: 829px;">Mulitplies the image data by the gain to convert from DN to electrons. </td> </tr> <tr> <td style="width: 595px; text-align: center;"><em><strong>doBlev</strong></em></td> <td style="width: 514px;"> <pre style="text-align: center;"> BLEVCORR</pre> </td> <td style="width: 829px;"> <p>For observations taken before Servicing Mission 4 (SM4), computes and subtracts the bias level from the image data.</p> <p>For observations taken after SM4, corrects for the signal-dependent bias shift, cross-talk, and bias-striping. </p> </td> </tr> <tr> <td style="width: 595px; text-align: center;"><em><strong>doNoise</strong></em></td> <td style="width: 514px; text-align: center;">NONE, applied to all CCD data</td> <td style="width: 829px;">Initializes the error array.</td> </tr> <tr> <td style="width: 595px; text-align: center;"><em><strong>doSink</strong></em></td> <td style="width: 514px;"> <pre style="text-align: center;"> SINKCORR</pre> </td> <td style="width: 829px;">Flags sink pixels and the adjacent affected pixels with the value 1024 in the DQ array of ACS/WFC images.</td> </tr> </tbody> </table> <p style="text-align: center;"> </p> </div> </div> </div> </div></li> <li> <div class="accordion-container panel"> <h4 id="h4-c78bafc1-c56c-467e-821b-6a620172491d" data-name="h4-acscte" class="accordion-header"> <button class="accordion__section-toggle collapsed accordion-header" id="tab_8727bf85-630b-491e-bb28-55e145075fdc_1_control" data-toggle="collapse" type="button" aria-label="acscte Navigation Section" aria-controls="tab_8727bf85-630b-491e-bb28-55e145075fdc_1_section" data-target="#tab_8727bf85-630b-491e-bb28-55e145075fdc_1_section" tabindex="0" aria-expanded="false"> <span class="accordion__title-text">acscte</span> </button> </h4> <div class="accordion__content collapse " aria-expanded="false" id="tab_8727bf85-630b-491e-bb28-55e145075fdc_1_section" aria-labelledby="tab_8727bf85-630b-491e-bb28-55e145075fdc_1_control"> <div class="accordion__content-inner light-background-"> <div><p>This task applies to pixel-based CTE correction to the ACS/WFC data.</p> <table data-module-dynamic="data-table" class="sortable-table filterable-table js-data-table display" data-b-sort="false" data-columns="[null,null,null]" data-dom="l<"sortable-table__toolbar"<"container-fluid">f><"sortable-table__wrapper"rt>ip" data-order="[]" data-searching="false" style="width:100%;"> <thead> <tr> <th data-datatable-hidden="false" data-datatable-sorting-direction="" data-datatable-sorting-order="" scope="col" style="width: 494px; text-align: center;">Function Name</th> <th data-datatable-hidden="false" data-datatable-sorting-direction="" data-datatable-sorting-order="" scope="col" style="width: 287px; text-align: center;">Header Switch</th> <th data-datatable-hidden="false" data-datatable-sorting-direction="" data-datatable-sorting-order="" scope="col" style="width: 1156px; text-align: center;">Action Applied</th> </tr> </thead> <tbody> <tr> <td style="width: 494px; text-align: center;">N/A</td> <td style="width: 287px;"> <pre style="text-align: center;"> PCTECORR</pre> </td> <td style="width: 1156px;">Applies the pixel-based CTE correction software to generate CTE-corrected products (e.g. FLC, CRC, or DRC)</td> </tr> </tbody> </table> <p> </p> </div> </div> </div> </div></li> <li> <div class="accordion-container panel"> <h4 id="h4-78f4836c-13bd-43d3-a1a9-7507b2916cf8" data-name="h4-ascrej" class="accordion-header"> <button class="accordion__section-toggle collapsed accordion-header" id="tab_8727bf85-630b-491e-bb28-55e145075fdc_2_control" data-toggle="collapse" type="button" aria-label="ascrej Navigation Section" aria-controls="tab_8727bf85-630b-491e-bb28-55e145075fdc_2_section" data-target="#tab_8727bf85-630b-491e-bb28-55e145075fdc_2_section" tabindex="0" aria-expanded="false"> <span class="accordion__title-text">ascrej</span> </button> </h4> <div class="accordion__content collapse " aria-expanded="false" id="tab_8727bf85-630b-491e-bb28-55e145075fdc_2_section" aria-labelledby="tab_8727bf85-630b-491e-bb28-55e145075fdc_2_control"> <div class="accordion__content-inner light-background-"> <div><p>For CR-SPLIT observations, this task will combine the individual observations and perform cosmic ray rejection. </p> <table data-module-dynamic="data-table" class="sortable-table filterable-table js-data-table display" data-b-sort="false" data-columns="[null,null,null]" data-dom="l<"sortable-table__toolbar"<"container-fluid">f><"sortable-table__wrapper"rt>ip" data-order="[]" data-searching="false" style="width:100%;"> <thead> <tr> <th data-datatable-hidden="false" data-datatable-sorting-direction="" data-datatable-sorting-order="" scope="col" style="text-align: center;">Function Name</th> <th data-datatable-hidden="false" data-datatable-sorting-direction="" data-datatable-sorting-order="" scope="col" style="text-align: center;">Header Switch</th> <th data-datatable-hidden="false" data-datatable-sorting-direction="" data-datatable-sorting-order="" scope="col" style="text-align: center;">Action Applied</th> </tr> </thead> <tbody> <tr> <td style="text-align: center;">N/A</td> <td> <pre style="text-align: center;"> CRCORR</pre> </td> <td>Runs the cosmic ray rejection routine to generate a single CRJ or CRC from a list of FLTs or FLCs.</td> </tr> </tbody> </table> <p style="text-align: center;"> </p> </div> </div> </div> </div></li> <li> <div class="accordion-container panel"> <h4 id="h4-518b77d0-241c-4923-9dc0-8673548b49c5" data-name="h4-acs2d" class="accordion-header"> <button class="accordion__section-toggle collapsed accordion-header" id="tab_8727bf85-630b-491e-bb28-55e145075fdc_3_control" data-toggle="collapse" type="button" aria-label="acs2d Navigation Section" aria-controls="tab_8727bf85-630b-491e-bb28-55e145075fdc_3_section" data-target="#tab_8727bf85-630b-491e-bb28-55e145075fdc_3_section" tabindex="0" aria-expanded="false"> <span class="accordion__title-text">acs2d</span> </button> </h4> <div class="accordion__content collapse " aria-expanded="false" id="tab_8727bf85-630b-491e-bb28-55e145075fdc_3_section" aria-labelledby="tab_8727bf85-630b-491e-bb28-55e145075fdc_3_control"> <div class="accordion__content-inner light-background-"> <div><p>This task is run on all ACS observations. A number of the header switches are detector-dependent.</p> <table data-module-dynamic="data-table" class="sortable-table filterable-table js-data-table display" data-b-sort="false" data-columns="[null,null,null]" data-dom="l<"sortable-table__toolbar"<"container-fluid">f><"sortable-table__wrapper"rt>ip" data-order="[]" data-searching="false" style="width:100%;"> <thead> <tr> <th data-datatable-hidden="false" data-datatable-sorting-direction="" data-datatable-sorting-order="" scope="col" style="text-align: center; width: 336px;">Function Name</th> <th data-datatable-hidden="false" data-datatable-sorting-direction="" data-datatable-sorting-order="" scope="col" style="text-align: center; width: 388px;">Header Switch</th> <th data-datatable-hidden="false" data-datatable-sorting-direction="" data-datatable-sorting-order="" scope="col" style="text-align: center; width: 1213px;">Action Applied</th> </tr> </thead> <tbody> <tr> <td style="text-align: center; width: 336px;"><em><strong>doDQI</strong></em></td> <td style="width: 388px;"> <pre style="text-align: center;"> DQICORR</pre> </td> <td style="width: 1213px;">If the DQ array has not already been initialized by acsccd, initializes the DQ array using information from the bad pixel table reference file.</td> </tr> <tr> <td style="text-align: center; width: 336px;"><em><strong>doNonLin</strong></em></td> <td style="text-align: center; width: 388px;"> <pre> LFLGCORR, GLINCORR</pre> </td> <td style="width: 1213px;">Corrects and flags non-linear data in observations taken with the SBC MAMA</td> </tr> <tr> <td style="text-align: center; width: 336px;"><em><strong>toElectrons</strong></em></td> <td style="text-align: center; width: 388px;">None</td> <td style="width: 1213px;">If the units of CCD data are not already electrons, multiplies by the gain to convert them.</td> </tr> <tr> <td style="text-align: center; width: 336px;"><em><strong>doNoise</strong></em></td> <td style="text-align: center; width: 388px;">None</td> <td style="width: 1213px;">Checks the error extension of the image to determine if there are non-zero values generated in previous steps. If the values are all zero, it computes the error using the applicable noise model.</td> </tr> <tr> <td style="text-align: center; width: 336px;"><em><strong>doDark</strong></em></td> <td style="text-align: center; width: 388px;"> <pre> DARKCORR</pre> </td> <td style="width: 1213px;">Performs the dark subtraction.</td> </tr> <tr> <td style="text-align: center; width: 336px;"><em><strong>doFlash</strong></em></td> <td style="text-align: center; width: 388px;"> <pre> FLSHCORR</pre> </td> <td style="width: 1213px;">Performs the flash subtraction.</td> </tr> <tr> <td style="text-align: center; width: 336px;"><em><strong>doFlat</strong></em></td> <td style="text-align: center; width: 388px;"> <pre> FLATCORR</pre> </td> <td style="width: 1213px;">Performs the flat-field division.</td> </tr> <tr> <td style="text-align: center; width: 336px;"><em><strong>doShad</strong></em></td> <td style="text-align: center; width: 388px;"> <pre> SHADCORR</pre> </td> <td style="width: 1213px;">Performs the CCD shutter shading correction. Currently skipped as calibration data show that a shading correction is not needed for ACS.</td> </tr> <tr> <td style="text-align: center; width: 336px;"><em><strong>doPhot</strong></em></td> <td style="text-align: center; width: 388px;"> <pre> PHOTCORR</pre> </td> <td style="width: 1213px;">Computes the photometric keywords values and populates them in the header.</td> </tr> <tr> <td style="text-align: center; width: 336px;"><em><strong>doStat</strong></em></td> <td style="text-align: center; width: 388px;">None</td> <td style="width: 1213px;">Computes basic image statistics. </td> </tr> </tbody> </table> <p style="text-align: center;"> </p> </div> </div> </div> </div></li> <li> <div class="accordion-container panel"> <h4 id="h4-bdda9b33-43df-4619-ab18-b064a166a74c" data-name="h4-acssum" class="accordion-header"> <button class="accordion__section-toggle collapsed accordion-header" id="tab_8727bf85-630b-491e-bb28-55e145075fdc_4_control" data-toggle="collapse" type="button" aria-label="acssum Navigation Section" aria-controls="tab_8727bf85-630b-491e-bb28-55e145075fdc_4_section" data-target="#tab_8727bf85-630b-491e-bb28-55e145075fdc_4_section" tabindex="0" aria-expanded="false"> <span class="accordion__title-text">acssum</span> </button> </h4> <div class="accordion__content collapse " aria-expanded="false" id="tab_8727bf85-630b-491e-bb28-55e145075fdc_4_section" aria-labelledby="tab_8727bf85-630b-491e-bb28-55e145075fdc_4_control"> <div class="accordion__content-inner light-background-"> <div><p>This task will combine repeated sub-exposures taken with the SBC MAMA</p> <table data-module-dynamic="data-table" class="sortable-table filterable-table js-data-table display" data-b-sort="false" data-columns="[null,null,null]" data-dom="l<"sortable-table__toolbar"<"container-fluid">f><"sortable-table__wrapper"rt>ip" data-order="[]" data-searching="false" style="width:100%;"> <thead> <tr> <th data-datatable-hidden="false" data-datatable-sorting-direction="" data-datatable-sorting-order="" scope="col" style="text-align: center; width: 361px;">Function Name</th> <th data-datatable-hidden="false" data-datatable-sorting-direction="" data-datatable-sorting-order="" scope="col" style="text-align: center; width: 346px;">Header Switch</th> <th data-datatable-hidden="false" data-datatable-sorting-direction="" data-datatable-sorting-order="" scope="col" style="text-align: center; width: 1230px;">Action Applied</th> </tr> </thead> <tbody> <tr> <td style="text-align: center; width: 361px;">N/A</td> <td style="text-align: center; width: 346px;">RPTCORR</td> <td style="width: 1230px;">Combines repeated sub-exposures using a straight pixel-to-pixel addition of the science values. Propagates uncertainties by summing in quadrature.</td> </tr> </tbody> </table> <p> </p> </div> </div> </div> </div></li> </ul> </div> </div><div class="component-block container-fluid"> <h3 data-index="0" id="h3-CK-9a0f42f4-173f-4a4d-bf15-72bce18679d8" data-name="h3-acstools">ACSTOOLS</h3> <p>To facilitate scripting of calibration workflows, the ACS Team developed the python package, <code>ACSTOOLS</code>. This package is a wrapper around the compiled C executables used by the <code>CALACS</code> pipeline. It provides users with an easy-to-use python interface, as well as, access to other utility functions developed by the ACS Team (e.g. the CTE forward modeler). The interface simplifies the process of building up calibration workflows, making it much easier for users to reprocess their data if they so choose. For more information on <code>ACSTOOLS</code>, please see the <a href="https://acstools.readthedocs.io/en/stable/">website</a>.</p> <h4 data-index="0" id="h4-CK-1ca0f6bd-88f0-4bf5-8872-fbd2d070674f" data-name="h4-example-usage">Example Usage</h4> <p>Suppose you wanted to reprocess CR-SPLIT observations while experimenting with the parameters in <code>CRREJTAB</code>. Accomplishing this using the executables is a drawn out process that involves iteratively modifying the parameters stored in the <code>CRREJTAB</code> reference file. A simpler way to do this is by leveraging the python interface provided with <code>ACSTOOLS</code>. In the section above on <code>CALACS</code>, we see that only two tasks are executed before <strong>acsrej</strong>. We write a simple python script to process our observations through <strong>acsccd</strong> and <strong>acscte </strong>to generate intermediate data products with this minimum level of required calibration completed.<strong> </strong></p> <pre> <code class="language-python">from acstools import acsccd, acscte # Run the acsccd task (*raw.fits -> *blv_tmp.fits) acsccd.acsccd('*raw.fits', time_stamps=True, verbose=True) # Run CTE correction (*blv_tmp.fits -> *blc_tmp.fits) acscte.acscte('*blv_tmp.fits')</code></pre> <p>Now that we have reached the level of calibration expected before entering the <strong>acsrej </strong>task, we can experiment with the parameters of <code>CRREJTAB</code> much more easily. The values stored in the <code>CRREJTAB</code> reference file (see Section 2 in <a href="/files/live/sites/www/files/home/hst/instrumentation/acs/documentation/instrument-science-reports-isrs/_documents/isr1805.pdf" title="ACS ISR 2018-05">ACS ISR 2018-05</a>) can be accessed through keyword arguments in the <code>ACSTOOLS</code> implementation. Instead of updating the reference file, change the values passed in the function call:</p> <pre> <code class="language-python">from acstools import acsrej acsrej.acsrej('*blc_tmp.fits', output='combined_product.fits', # output filename crsigmas='6,5,4', # specify the rejection threshold crradius=0.75, # specify the propagation radius initgues='med') # specify the method for computing the initial guess</code></pre> <p> </p> <script>hljs.initHighlightingOnLoad();</script> </div></section><div class="container-fluid timestamp"> Last Updated: 03/13/2025</div><section class="credits section-row dark-background-stsci-dark-blue"> <div class="container-fluid"> <div class="row"> <div class="col-xs-12"> <h2 id="h2-sr-only-pre-footer" class="sr-only">Pre-footer</h2> <div class="component-block container-fluid"> <div class="column-layout column-layout--with-dividers"> <div class="column-layout__column col-xs-12 col-md-8"> <div class="component-block container-fluid"> <h3 class="no-margin-top" data-name="h3-hst-help-desk" id="h3-CK-7378ba75-443a-4ca1-9dee-425c8f821830">HST Help Desk</h3> <p>Please contact the <a href="https://web.archive.org/web/20250120070528/https://stsci.service-now.com/hst" target="_blank">HST Help Desk</a> with any questions. </p> <script>hljs.initHighlightingOnLoad();</script> </div></div> <div class="column-layout__column col-xs-12 col-md-4"> <div class="social-media"> <p>Follow HST</p> <ul role="list" class="footer__link-list--icons list-inline"> <li> <a href="https://twitter.com/HubbleTelescope" target="_blank" aria-label="x" class="has-icon"> <span class="svg-sprite -x"> <svg role="img" focusable="false" aria-hidden="true"> <use xlink:href="#x"></use> </svg> </span> </a> </li><li> <a href="https://www.facebook.com/HubbleTelescope/" target="_blank" aria-label="facebook" class="has-icon"> <span class="svg-sprite -facebook"> <svg role="img" focusable="false" aria-hidden="true"> <use xlink:href="#facebook"></use> </svg> </span> </a> </li><li> <a href="https://www.flickr.com/photos/40523828@N07" target="_blank" aria-label="flickr" class="has-icon"> <span class="svg-sprite -flickr"> <svg role="img" focusable="false" aria-hidden="true"> <use xlink:href="#flickr"></use> </svg> </span> </a> </li><li> <a href="https://www.youtube.com/user/HubbleSiteChannel" target="_blank" aria-label="youtube" class="has-icon"> <span class="svg-sprite -youtube"> <svg role="img" focusable="false" aria-hidden="true"> <use xlink:href="#youtube"></use> </svg> </span> </a> </li></ul> </div></div> </div> </div></div> </div> </div> </section></div> </main> <div data-module-dynamic="scroll-affix" data-activate-on-scroll="true" class="back-to-top"> <a class="back-to-top-button" href="#body" data-module-dynamic="scroll-to" aria-label="back to top"> <span class="svg-sprite -back-to-top"> <svg role="img" focusable="false" aria-hidden="true"> <use xlink:href="#back-to-top"></use> </svg> </span> </a> </div> </section> <footer class="footer dark-background-"> <h2 id="h2-sr-only-footer" class="sr-only">Footer</h2> <div class="container-fluid"> <div class="row"> <nav aria-labelledby="h3-sr-only-3dfaf367-ce4b-41ac-9c54-e8af6192041c"> <h3 id="h3-sr-only-3dfaf367-ce4b-41ac-9c54-e8af6192041c" data-name="h3-sr-only-secondary-navigation" class="sr-only">Secondary Navigation</h3> <div class="col-md-2 hidden-xs hidden-sm footer__logo"> <a href="/home" class=" no-file-icon" > <img alt="Space Telescope Science Institute Logo" src="/files/live/sites/www/files/home/_images/footer/stsci_pri_combo_mark_white_bkgd.png?t=thumbnail" srcset="/files/live/sites/www/files/home/_images/footer/stsci_pri_combo_mark_white_bkgd.png?t=thumbnail 150w, /files/live/sites/www/files/home/_images/footer/stsci_pri_combo_mark_white_bkgd.png?t=tn370 370w" sizes="200px" /></a></div> <ul role="list" class="footer__link-list list-inline col-md-5"> <li><a href="/who-we-are" class="" target="_self"> Who We Are</a></li> <li><a href="/events/webcasts" class="" target="_self"> Webcasts</a></li> <li><a href="http://archive.stsci.edu/" class="" target="_blank"> MAST</a></li> <li><a href="/news" class="" target="_self"> News Center</a></li> <li><a href="https://proper.stsci.edu/proper/authentication/auth" class="" target="_blank"> MyST</a></li> <li><a href="/contact" class="" target="_self"> Contact Us</a></li> <li><a href="/opportunities" class="" target="_self"> Opportunities</a></li> <li><a href="/events" class="" target="_self"> Events</a></li> <li><a href="/site-map" class="" target="_self"> Sitemap</a></li> </ul> </nav><nav class="col-xs-12 col-md-4" aria-labelledby="h3-sr-only-a3d205b7-ff35-46f2-b3ac-213cc9dd832c"> <h3 id="h3-sr-only-a3d205b7-ff35-46f2-b3ac-213cc9dd832c" data-name="h3-sr-only-social-media" class="sr-only">Social Media</h3> <ul role="list" class="footer__link-list--icons list-inline"> <li> <a href="https://www.facebook.com/stsci/" target="_blank" aria-label="facebook" class="has-icon"> <span class="svg-sprite -facebook"> <svg role="img" focusable="false" aria-hidden="true"> <use xlink:href="#facebook"></use> </svg> </span> </a> </li><li> <a href="https://twitter.com/spacetelescope" target="_blank" aria-label="x" class="has-icon"> <span class="svg-sprite -x"> <svg role="img" focusable="false" aria-hidden="true"> <use xlink:href="#x"></use> </svg> </span> </a> </li><li> <a href="https://www.instagram.com/space_telescopes" target="_blank" aria-label="instagram" class="has-icon"> <span class="svg-sprite -instagram"> <svg role="img" focusable="false" aria-hidden="true"> <use xlink:href="#instagram"></use> </svg> </span> </a> </li><li> <a href="https://www.youtube.com/channel/UCQXVf-94-RV7NVTOhVCNTiQ" target="_blank" aria-label="youtube" class="has-icon"> <span class="svg-sprite -youtube"> <svg role="img" focusable="false" aria-hidden="true"> <use xlink:href="#youtube"></use> </svg> </span> </a> </li><li> <a href="https://bsky.app/profile/spacetelescope.bsky.social" target="_blank" aria-label="bluesky" class="has-icon"> <span class="svg-sprite -bluesky"> <svg role="img" focusable="false" aria-hidden="true"> <use xlink:href="#bluesky"></use> </svg> </span> </a> </li></ul> </nav><nav class="col-xs-12 col-md-4" aria-labelledby="h3-sr-only-90f8eefd-823f-4712-9340-23bd8020378e"> <h3 id="h3-sr-only-90f8eefd-823f-4712-9340-23bd8020378e" data-name="h3-sr-only-utility-navigation" class="sr-only">Utility Navigation</h3> <ul role="list"class="footer__link-list list-inline footer__link-list__utility"> <li><a href="/copyright" class="" target="_self"> Copyright</a></li> <li><a href="/privacy" class="" target="_self"> Privacy</a></li> <li><a href="/accessibility-statement" class="" target="_self"> Accessibility</a></li> </ul> </nav><div class="logo-container"> </div></div> </div> </footer> </div> <div id="spriteSheet" class="svg-sprite-sheet sr-only" aria-hidden="true"> </div>  <script> $(function(){ let svg; svg = "/modules/stsci-www-assets/assets/svg/www-2534f7e761.svg"; $("#spriteSheet").load(svg, function() { $('.animate-icon').trigger('spriteSheetLoaded') }); }); </script>  <script src="//vjs.zencdn.net/8.5.2/video.min.js"></script> </body> </html>