LaTeX2e class for Astronomy & Astrophysics

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</li>      <li class="md-nav__item"> <a href="../stats/index.html" class="md-nav__link"> arXiv Usage Stats </a> </li> </ul> </nav> </div> </div> </div> <div class="md-sidebar md-sidebar--secondary" data-md-component="sidebar" data-md-type="toc" > <div class="md-sidebar__scrollwrap"> <div class="md-sidebar__inner">    <nav class="md-nav md-nav--secondary" aria-label="Table of contents">  <label class="md-nav__title" for="__toc"> <span class="md-nav__icon md-icon"></span> Table of contents </label> <ul class="md-nav__list" data-md-component="toc" data-md-scrollfix> <li class="md-nav__item"> <a href="#latex2e-class-for-astronomy-astrophysics" class="md-nav__link"> LaTeX2e class for Astronomy & Astrophysics </a> <nav class="md-nav" aria-label="LaTeX2e class for Astronomy & Astrophysics"> <ul class="md-nav__list"> <li class="md-nav__item"> <a href="#dont-forget-to-check-the-pdf" class="md-nav__link"> Don't Forget to Check the PDF! </a> </li> <li class="md-nav__item"> <a 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<p>arXiv uses <strong>aa.cls version 9.0</strong>. This version requires a flag for backward compatibility between earlier versions (7.x, and below) of the aa.cls file. This looks like:</p> <pre><code>\documentclass[bibyear]{aa} </code></pre> <p>For additional information please consult the <a href="http://www.aanda.org/author-information/latex-issues/texnical-background-information">A\&A website</a>.</p> <p>arXiv used <strong>aa.cls version 6.1</strong> <code>[2006/06/01 v6.1 LaTeX document class for Astronomy and Astrophysics journal]</code> for new submissions and replacements received since early 2007, until TexLive 2011 (which used <strong>aa.cls version 7.0</strong>).</p> <p>arXiv has used <strong>aa.cls version 5.2</strong> for new submissions and replacements received after the end of September 2002.</p> <p>You must use the <strong>letterpaper</strong> class option to ensure proper printout on standard US letter paper.</p> <p>The <code>sidecaption</code> layout conflicts with our automatic use of HyperTeX. If you use the <code>sidecaption</code> layout you must <a href="http://arxiv.org/help/faq/mistakes#nohypertex">disable HyperTeX for your submission</a>.</p> <h2 id="dont-forget-to-check-the-pdf">Don't Forget to Check the PDF!</h2> <p>As always, carefully check the diagnostic messages on screen and <span class="note">verify the PDF generated by arXiv <em>before</em> the paper is announced</span>.</p> <hr /> <h2 id="historical-note">Historical note</h2> <p>When EDP became publisher of <a href="http://www.edpsciences.org/aa/">Astronomy & Astrophysics</a> they modified the existing LaTeX2e class files in a backwards incompatible way without changing the name of the class file or at least appending a version qualifier to the filename. Obviously this causes conflicts for large TeX installations like arXiv's with a large number of papers requiring the previous version of aa.cls for proper processing.</p> <p>Since we need to ensure that previously archived papers are not adversely affected by these updates, we could not simply install the latest version. The solution we adopted was to version arXiv's TeX tree. By default, papers submitted before October 2002 are processed with version 4.05 (Dec 1995) and those from October 2002 onward are processed with version 5.20 (June 2002).</p> <h3 id="explicitly-selecting-a-version-of-the-astronomy-astrophysics-class-file">Explicitly selecting a version of the Astronomy & Astrophysics class file</h3> <p>You may either:</p> <ol> <li>Bundle your version of aa.cls and possibly other class and style files with your paper. These will be used instead of any system files with the same name.</li> <li>Use a version qualifier for the class file name. 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