Forensic Topography and Surface Metrology

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We seek to advance SI-traceable measurements by developing methods to characterize and reduce measurement uncertainty, and by providing best-in-class calibrations, standard reference materials (SRMs), and reference software. A major application area addressed by the project is forensic firearm and toolmark identification, which is based on comparing microscopic marks in the topography of forensic samples. 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id="main-content" tabindex="-1"></a> <div class="grid-container margin-top-4"> <div class="nist-page__region nist-page__region--content-top"> <div class="nist-block"> <a class="usa-button usa-button--accent-cool" href="/web/20240226194649/https://www.nist.gov/laboratories/projects-programs">PROJECTS/PROGRAMS</a> </div> <div class="nist-block"> <h1 class="nist-page__title">Forensic Topography and Surface Metrology</h1> </div> <div class="nist-block">  <div data-elastic-exclude class="nist-block nist-social__wrapper"> <h2 class="nist-social__title">Share</h2> <div class="social-media-sharing"> <div class="nist-social__wrapper--share"> <div> <a target="_blank" rel="noopener" href="https://web.archive.org/web/20240226194649/https://www.facebook.com/share.php?u=https://www.nist.gov/programs-projects/forensic-topography-and-surface-metrology" title="Facebook" class="nist-social nist-social--facebook-gray"> <span>Facebook</span> </a> </div> <div> <a target="_blank" rel="noopener" href="https://web.archive.org/web/20240226194649/https://www.linkedin.com/shareArticle?mini=true&url=https://www.nist.gov/programs-projects/forensic-topography-and-surface-metrology&source=https://www.nist.gov/programs-projects/forensic-topography-and-surface-metrology" title="Linkedin" class="nist-social nist-social--linkedin-gray"> <span>Linkedin</span> </a> </div> <div> <a target="_blank" rel="noopener" href="https://web.archive.org/web/20240226194649/https://twitter.com/intent/tweet?url=https://www.nist.gov/programs-projects/forensic-topography-and-surface-metrology&status=https://www.nist.gov/programs-projects/forensic-topography-and-surface-metrology" title="Twitter" class="nist-social nist-social--twitter-gray"> <span>Twitter</span> </a> </div> <div> <a href="https://web.archive.org/web/20240226194649/mailto:/?subject=NIST.gov&body=Check out this site https://www.nist.gov/programs-projects/forensic-topography-and-surface-metrology" title="Email" class="nist-social nist-social--envelope-gray"> <span>Email</span> </a> </div> </div> </div> </div>  </div> </div> </div> <div class="grid-container margin-top-4"> <div class="grid-row grid-gap-6"> <div class="nist-page__region nist-page__region--content tablet-lg:grid-col-8"> <div class="nist-block gray-box"> <div class="text-long"> <h2>Summary</h2> <p>This project provides methods, standards, and services for characterizing surface texture and microform in manufacturing, forensics, and science. We seek to advance SI-traceable measurements by developing methods to characterize and reduce measurement uncertainty, and by providing best-in-class calibrations, standard reference materials (SRMs), and reference software. A major application area addressed by the project is forensic firearm and toolmark identification, which is based on comparing microscopic marks in the topography of forensic samples. Here we contribute to the scientific infrastructure needed for objective forensic evaluations by developing traceable measurement methods, objective comparison metrics, and statistically rigorous procedures to obtain quantitative estimates for uncertainty or weight of evidence.</p> </div> </div> <div class="nist-block"> <h2 class="nist-block__title">Description</h2> <div class="text-with-summary"> <figure class=" align-right nist-image--lightbox nist-image" role="group"><div data-lightbox="https://www.nist.gov/sites/default/files/styles/2800_x_2800_limit/public/images/2021/02/02/artifact.jpg?itok=7URfutjk" data-media-id="600571"> <img alt="artifact illustration" height="351" loading="lazy" src="/web/20240226194649im_/https://www.nist.gov/sites/default/files/styles/480_x_480_limit/public/images/2021/02/02/artifact.jpg?itok=oAGeC3DG" typeof="foaf:Image" width="480"/></div> <figcaption class="nist-image__caption">Random profile roughness artifact to characterize the accuracy of a surface roughness measurement instrument. We are developing an updated SRM with low roughness average (Ra of 0.05 µm).</figcaption></figure><h4>Surface texture and microform</h4> <p>Surface texture affects the functionality of many products, ranging from bearings to semiconductors and optics. Affected properties include aesthetics, friction, wear, lubrication, sealing, light scattering, and conductivity. Improvements in parameters and metrology to characterize surface texture enable innovations and facilitate commerce. Major challenges are the large variety of applications, the large number of parameters available to specify and characterize surface texture, and the large array of mechanical and optical measurement techniques. The project seeks to advance SI-traceable metrology of surface texture and microform through:</p> <ul><li>Best-in-class, highly leveraged, calibrations of transfer standards for surface roughness, step height, lateral spacing, and microform. We furthermore provide SRMs for instrument calibration and quality control. Millions of surface topography measurements in the U.S. are SI-traceable through these calibrations and SRMs.</li> <li> <figure class=" align-right nist-image--lightbox nist-image" role="group"><div data-lightbox="https://www.nist.gov/sites/default/files/styles/2800_x_2800_limit/public/images/2021/02/02/mechanical%20stylus%20instrument.png?itok=iCFH0uzY" data-media-id="600576"> <img alt="Mechanical stylus instrument" height="383" loading="lazy" src="/web/20240226194649im_/https://www.nist.gov/sites/default/files/styles/480_x_480_limit/public/images/2021/02/02/mechanical%20stylus%20instrument.png?itok=plpIBd0A" typeof="foaf:Image" width="480"/></div> <figcaption class="nist-image__caption">Mechanical stylus instrument at NIST for surface texture and microform measurements. The insert shows examples of specialized artifacts used for its calibration.</figcaption></figure> Leadership in the development of national and international documentary standards. These standards provide definitions and procedures for surface texture specification, topography measurement, instrument calibration, and measurement uncertainty evaluation.</li> <li>Reference software and datasets for validating the values of surface texture parameters calculated by surface analysis software. We provide an interactive website, the <a href="https://web.archive.org/web/20240226194649/https://physics.nist.gov/smats">Surface Metrology Algorithm Testing System (SMATS)</a>, that enables the user to compare our calculated parameter values with those obtained by the user's software.</li> <li>Parameters and calibrations for the microform of standard hardness Rockwell-C (HRC) diamond indenters. Our world-leading low measurement uncertainty benefits the calibration of hundreds of NIST SRM 2810-2812 HRC hardness standard blocks.</li> </ul><figure class=" align-right nist-image--lightbox nist-image" role="group"><div data-lightbox="https://www.nist.gov/sites/default/files/styles/2800_x_2800_limit/public/images/2021/02/02/primer%20surface.png?itok=Y426zRAr" data-media-id="600581"> <img alt="primer surface" height="424" loading="lazy" src="/web/20240226194649im_/https://www.nist.gov/sites/default/files/styles/480_x_480_limit/public/images/2021/02/02/primer%20surface.png?itok=8HWqqtHh" typeof="foaf:Image" width="480"/></div> <figcaption class="nist-image__caption">False color 3D image of the measured topography of the primer surface at the bottom of a fired cartridge case. The color indicates surface height. The diameter of the imaged area is approximately 3.8 mm. The dark blue center is the impression from the firearm’s firing pin.</figcaption></figure><h4>Firearm and toolmark examination</h4> <p>Forensic firearm and toolmark examination is based on comparing the surface topography of forensic samples, such as fired bullets and ejected cartridge cases. When a firearm is fired, it leaves microscopic toolmarks on the bullet and cartridge case. Forensic examiners compare these marks to determine whether two cartridge cases or bullets were fired from the same firearm. Currently, this evaluation is subjective, relying on an examiner’s expertise and judgement. The evaluation is challenging, not only because there are differences between marks generated by the same firearm, but also because there are possible similarities between marks generated by different firearms. There are two major shifts occurring in this forensic area: 1) a transition from two-dimensional (2D) reflectance microcopy images of toolmarks to three-dimensional (3D) topography images, and 2) a desired transition from subjective match/no-match assessments to objective comparisons with a rigorous evaluation of uncertainty to quantify the weight of evidence. We address these challenges through:</p> <ul><li>Characterization and improvement of measurement techniques, and the development of standards and best practice guides for measurement quality assurance in forensic labs. Many forensic labs use the NIST <a data-entity-substitution="canonical" data-entity-type="node" data-entity-uuid="9e1d91d2-13fa-46dd-8bd9-86325de51e61" href="/web/20240226194649/https://www.nist.gov/pml/sensor-science/surface-and-interface-metrology/standard-bullets-and-cartridge-cases" title="Standard Bullets and Cartridge Cases">SRM 2460 Standard Bullet and SRM 2461 Standard Cartridge Case</a> for for quality control.</li> <li>Research to improve the scientific foundation for firearm and toolmark examination. Our focus is on metrics and algorithms for objective comparisons, and on statistical methods to quantify the weight of evidence.</li> <li>Reference and <a href="https://web.archive.org/web/20240226194649/https://tsapps.nist.gov/NRBTD">research</a> databases of firearm toolmark images of bullets and cartridge cases. The databases are needed for the development and validation of methods for objective identification and the development of statistical models for weight of evidence estimation.</li> </ul> </div> </div> <div class="nist-block"> <h2 class="nist-block__title">Major Accomplishments</h2> <div class="text-long"><p><strong>2020</strong></p> <ul><li>Leadership in completing the 2019 update of the ASME B46.1 standard “Surface Texture (Surface Roughness, Waviness, and Lay).” The standard provides a comprehensive overview of surface texture parameters and measurement methods. </li> <li>Pilot study on the objective comparison of fragmented or severely deformed bullets. The study showed improved comparison results through the application of an image reconstruction procedure of the deformed striation marks in combination with the Congruent Matching Profile Segments (CMPS) comparison method developed at NIST. </li> <li>Feasibility study on the application of objective comparison methods to scenarios where the evidence firearm is inoperable. In the study, the Congruent Matching Cells (CMC) method was successfully applied to compare the firearm breech face impression on cartridge cases with casts of the breech face of “inoperable” firearms. No significant change in comparison performance was observed.</li> <li>Application of CMC comparison score distribution models for firearm breech face impressions on cartridge cases to obtain a quantitative expression for the weight of evidence of a comparison result as a likelihood ratio. </li> </ul><p><strong>2019</strong></p> <ul><li>Leadership in completing the new ISO standard 25178-600:2019 “Geometrical product specifications (GPS) – Surface texture: Areal – Part 600: Metrological characteristics for areal topography measuring methods.” The standard defines generic metrological characteristics of measurement instruments that are important for instrument performance evaluation and measurement uncertainty estimation.</li> <li>High-resolution 2D images and 3D topography models of ballistic samples from the President John F. Kennedy assassination. The National Archives and Records Administration (NARA) requested the measurement data for digital preservation and to facilitate public access. The project extended the limits of toolmark measurement and representation for complex bullet fragments.</li> <li>Congruent Matching Profile Segments (CMPS) method for objective comparison of striated tool marks and its application to bullet comparisons. The method is derived from the Congruent Matching Cells (CMC) method developed at NIST for the comparison of impressed tool marks. The CMPS method is designed to increase comparison accuracy by addressing the challenges of differences in same-source striae profiles caused by varying lateral/vertical scales and sections of striae that are poorly marked.</li> <li>Re-calibration of two NIST primary standard Rockwell diamond indenters using the NIST microform calibration system established in 1995. The results demonstrated a long-term reproducibility for both the NIST standard indenters and the calibration system, which support NIST’s leading position in international hardness standardization.</li> </ul><p><strong>2018</strong></p> <ul><li>Development and certification of the NIST SRM 2460a Standard Bullet Replica for quality control of bullet measurements in forensic labs. The polymer SRM with a sputter-coated metal surface is a high-precision, low-cost, replica of our sold-out, diamond-turned, copper SRM 2460 standard bullet.</li> <li>Overview paper on the quality assurance challenges faced by forensic laboratories when integrating 3D topography metrology into casework.</li> <li>Statistical distribution models to estimate the error rate of firearm identification results obtained using Congruent Matching Cells (CMC). The CMC method was developed at NIST for the objective comparison of impressed toolmarks, such as firearm breech face impressions on cartridge cases. The method holds promise for very low false positive error rates. </li> </ul></div> </div> <div class="nist-block"> <div class="usa-accordion " aria-multiselectable="false"> <div class="text-long"> <h2 class="usa-accordion__heading"> <button class="usa-accordion__button" aria-expanded="false" aria-controls="field_project_associated_product"> Associated Product(s) </button> </h2> <div id="field_project_associated_product" class="usa-accordion__content"> <ul><li><a data-entity-substitution="canonical" data-entity-type="taxonomy_term" data-entity-uuid="ec907f7c-f7ef-4e41-ae1e-7543f218db7f" href="/web/20240226194649/https://www.nist.gov/topic-terms/dimensional-metrology" title="Dimensional metrology">Dimensional Metrology</a></li> <li><a data-entity-substitution="canonical" data-entity-type="taxonomy_term" data-entity-uuid="f7969ac9-df9e-4c58-a1a4-03bfc4d76cf4" href="/web/20240226194649/https://www.nist.gov/topic-terms/forensic-science" title="Forensic Science">Forensic science</a></li> 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class="term"><li><a href="/web/20240226194649/https://www.nist.gov/nist-organizations/nist-headquarters/laboratory-programs/physical-measurement-laboratory/sensor-7" class="selected" hreflang="en">Surface and Interface Metrology Group</a></li></ul></li></ul></li></ul></li></ul></li></ul> </div> </div> <div class="nist-related-orgs"></div> <div class="nist-related-orgs"></div> <div class="nist-related-orgs"></div> <div class="nist-related-orgs"></div> </div> </div> </div>  <div class="nist-block nist-block--contact"> <h2 class="nist-block__title">NIST Staff</h2> <div class="nist-field nist-field--label-hidden entity-reference nist-field--no-margin nist-field--link-list"> <div class="nist-field__items"> <div class="nist-field__item"> <a href="/web/20240226194649/https://www.nist.gov/people/thomas-brian-renegar" rel="bookmark"><span>Thomas Brian Renegar</span> </a> </div> <div class="nist-field__item"> <a href="/web/20240226194649/https://www.nist.gov/people/ulf-griesmann" rel="bookmark"><span>Ulf Griesmann</span> </a> </div> <div class="nist-field__item"> <a href="/web/20240226194649/https://www.nist.gov/people/jun-feng-song" rel="bookmark"><span>Jun-Feng Song</span> </a> </div> <div class="nist-field__item"> <a href="/web/20240226194649/https://www.nist.gov/people/johannes-soons" rel="bookmark"><span>Johannes A. Soons</span> </a> </div> <div class="nist-field__item"> <a href="/web/20240226194649/https://www.nist.gov/people/michael-t-stocker" rel="bookmark"><span>Michael T. Stocker</span> </a> </div> <div class="nist-field__item"> <a href="/web/20240226194649/https://www.nist.gov/people/robert-m-thompson" rel="bookmark"><span>Robert M Thompson</span> </a> </div> <div class="nist-field__item"> <a href="/web/20240226194649/https://www.nist.gov/people/theodore-v-vorburger" rel="bookmark"><span>Theodore V. Vorburger</span> </a> </div> <div class="nist-field__item"> <a href="/web/20240226194649/https://www.nist.gov/people/james-h-yen" rel="bookmark"><span>James H. Yen</span> </a> </div> <div class="nist-field__item"> <a href="/web/20240226194649/https://www.nist.gov/people/xiaoyu-alan-zheng" rel="bookmark"><span>Xiaoyu Alan Zheng</span> </a> </div> </div> </div> </div> <div class="nist-block nist-block--contact"> <h2 class="nist-block__title">Contact</h2> <div class="nist-contact"> <ul class="nist-contact__items"> <li about="/people/johannes-soons" class="nist-contact__item"> <div class="nist-contact__name"><a href="/web/20240226194649/https://www.nist.gov/people/johannes-soons" title="View staff profile page">Johannes A. Soons</a></div> <div> <a href="https://web.archive.org/web/20240226194649/mailto:johannes.soons@nist.gov">johannes.soons@nist.gov</a> </div> <div> (301) 975-6474 </div> </li> </ul> </div> </div> <div class="nist-block"> <h2 class="nist-block__title">Project Status</h2> <div class="nist-badge display-inline-block margin-y-1 nist-badge--blue boolean">Ongoing</div> </div> <div class="nist-block"> <h2 class="nist-block__title">Related News</h2> <div class="nist-field nist-field--label-hidden nist-field--link-list entity-reference"> <div class="nist-field__items"> <div class="nist-field__item"><a href="/web/20240226194649/https://www.nist.gov/news-events/news/2020/03/divide-and-conquer-new-algorithm-examines-crime-scene-bullets-segment" hreflang="en">Divide and Conquer: New Algorithm Examines Crime-Scene Bullets Segment by Segment</a></div> <div class="nist-field__item"><a href="/web/20240226194649/https://www.nist.gov/news-events/news/2019/12/kennedy-assassination-bullets-preserved-digital-form" hreflang="en">Kennedy Assassination Bullets Preserved in Digital Form</a></div> <div class="nist-field__item"><a href="/web/20240226194649/https://www.nist.gov/news-events/news/2018/02/how-good-match-it-putting-statistics-forensic-firearms-identification" hreflang="en">How Good a Match is It? Putting Statistics into Forensic Firearms Identification</a></div> <div class="nist-field__item"><a href="/web/20240226194649/https://www.nist.gov/news-events/news/2016/07/nist-3d-ballistics-research-database-goes-live" hreflang="en">NIST 3D Ballistics Research Database Goes Live</a></div> </div> </div> </div> <div class="nist-block"> <h2 class="nist-block__title">Related Publications</h2> <div class="nist-field nist-field--label-hidden nist-field--link-list entity-reference"> <div class="nist-field__items"> <div class="nist-field__item"><a href="/web/20240226194649/https://www.nist.gov/publications/nist-ballistics-toolmark-research-database-0" hreflang="en">NIST Ballistics Toolmark Research Database</a></div> <div class="nist-field__item"><a href="/web/20240226194649/https://www.nist.gov/publications/pilot-study-deformed-bullet-correlation" hreflang="en">Pilot Study on Deformed Bullet Correlation</a></div> <div class="nist-field__item"><a href="/web/20240226194649/https://www.nist.gov/publications/fired-bullet-signature-correlation-using-congruent-matching-profile-segments-cmps" hreflang="en">Fired Bullet Signature Correlation Using the Congruent Matching Profile Segments (CMPS) Method</a></div> <div class="nist-field__item"><a href="/web/20240226194649/https://www.nist.gov/publications/addressing-quality-assurance-issues-3d-firearm-and-toolmark-imaging" hreflang="en">Addressing Quality Assurance Issues in 3D Firearm and Toolmark Imaging</a></div> <div class="nist-field__item"><a href="/web/20240226194649/https://www.nist.gov/publications/normalized-congruent-matching-area-method-correlation-breech-face-impression-images" hreflang="en">A Normalized Congruent Matching Area Method for the Correlation of Breech Face Impression Images</a></div> <div class="nist-field__item"><a href="/web/20240226194649/https://www.nist.gov/publications/estimating-error-rates-firearm-evidence-identifications-forensic-science" hreflang="en">Estimating Error Rates for Firearm Evidence Identifications in Forensic Science</a></div> <div class="nist-field__item"><a href="/web/20240226194649/https://www.nist.gov/publications/identifying-persistent-and-characteristic-features-firearm-tool-marks-cartridge-cases" hreflang="en">Identifying Persistent and Characteristic Features in Firearm Tool Marks on Cartridge Cases</a></div> <div class="nist-field__item"><a href="/web/20240226194649/https://www.nist.gov/publications/convergence-algorithm-correlation-breech-face-images-based-congruent-matching-cells-cmc" hreflang="en">A Convergence Algorithm for Correlation of Breech Face Images Based on the Congruent Matching Cells (CMC) Method</a></div> </div> </div> </div> <div class="nist-block"> <h2 class="nist-block__title">Facilities</h2> <div class="text-long"><p><strong>Specialized Equipment:</strong></p> <ul><li>Mechanical stylus profilometers for surface texture and microform measurements. Achievable step height measurement repeatability is on the order of 0.04 nm. Available vertical and lateral range are 12 mm and 200 mm, respectively, with a lateral point spacing of 0.125 µm.</li> <li>Optical profilers for three-dimensional surface topography measurement using different measurement methods (confocal, focus variation, phase shifting interferometry, and coherence scanning interferometry). Measurement noise as low as 0.04 nm for an optical flat. Capability to perform stitched measurements on rotated and translated samples.</li> <li>Toolmark replication facility using polymer replication techniques including vacuum-degassing and metal sputter coating equipment.</li> </ul><p><strong>Specialized, Best-In-Class, Measurement Capabilities:</strong></p> <ul><li>Surface roughness calibrations with nanometer level standard uncertainties (Ra).</li> <li>Step height calibrations down to 0.08 nm standard uncertainty.</li> <li>Mean spacing of profile elements (RSm) down to 0.014 % standard uncertainty.</li> <li>Microform calibration with the world's lowest uncertainty for the microform of standard Rockwell hardness diamond indenters.</li> </ul></div> </div> <h2 class="nist-block__title"> CUSTOMERS/CONTRIBUTORS<br>/COLLABORATORS </h2> <div class="text-long"><p>Our customers and collaborators are interested in our measurement expertise, unique measurement capabilities, unbiased standards contributions, and experience in the development of advanced algorithms and statistical models. Customers and collaborators include:</p> <ul><li>Manufacturers of surface topography measurement instruments and calibration artifacts.</li> <li>Measurement and calibration service providers.</li> <li>Users of surface texture measurement instruments from Government agencies and many industrial sectors, e.g., automotive, aerospace, semiconductor, consumer electronics, defense, medical, and optics & photonics. </li> <li>Federal, state, and local forensic laboratories</li> <li>Academia</li> </ul></div> </div> </aside> </div> </div> <div class="grid-container"> <div class="nist-page__region nist-page__region--content-bottom"> <div class="nist-block"> <div class="text-italic font-sans-2xs"> Created April 19, 2013, Updated February 25, 2021 </div> </div> </div> </div> </section> </div> <div data-elastic-exclude>  <footer class="nist-footer padding-bottom-4"> <div class="grid-container nist-footer__info"> <div class="grid-row"> <div class="tablet:grid-col-6"> <div class="nist-footer__logo"> <a href="/web/20240226194649/https://www.nist.gov/" title="National Institute of Standards and Technology" rel="home"> <img class="nist-footer__logo-img" src="/web/20240226194649im_/https://www.nist.gov/libraries/nist-component-library/dist/img/logo/NIST-Logo-Brand-White.svg" alt="National Institute of Standards and Technology logo" width="300px" height="42px"/> </a> </div> <div class="nist-footer__contact"> <h3 class="nist-footer__contact-heading">HEADQUARTERS</h3> <address> 100 Bureau Drive<br> Gaithersburg, MD 20899<br> <a href="https://web.archive.org/web/20240226194649/tel:301-975-2000">301-975-2000</a> </address> <p> <a href="https://web.archive.org/web/20240226194649/mailto:do-webmaster@nist.gov">Webmaster</a> | <a href="https://web.archive.org/web/20240226194649/https://www.nist.gov/about-nist/contact-us">Contact Us</a> | <a href="https://web.archive.org/web/20240226194649/https://www.nist.gov/visit">Our Other Offices</a> </p> </div> </div> <div class="tablet:grid-col-6"> <div class="nist-footer__social-links"> <a class="nist-social nist-social--twitter-white" href="https://web.archive.org/web/20240226194649/https://twitter.com/NIST"> <span>Twitter</span> </a> <a class="nist-social nist-social--facebook-white" href="https://web.archive.org/web/20240226194649/https://www.facebook.com/NIST"> <span>Facebook</span> </a> <a class="nist-social nist-social--linkedin-white" href="https://web.archive.org/web/20240226194649/https://www.linkedin.com/company/nist"> <span>LinkedIn</span> </a> <a class="nist-social nist-social--instagram-white" href="https://web.archive.org/web/20240226194649/https://www.instagram.com/nist/"> <span>Instagram</span> </a> <a class="nist-social nist-social--youtube-white" href="https://web.archive.org/web/20240226194649/https://www.youtube.com/NIST"> <span>YouTube</span> </a> <a class="nist-social nist-social--giphy-white" href="https://web.archive.org/web/20240226194649/https://giphy.com/nist"> <span>Giphy</span> </a> <a class="nist-social nist-social--rss-white" href="https://web.archive.org/web/20240226194649/https://www.nist.gov/news-events/nist-rss-feeds"> <span>RSS Feed</span> </a> <a class="nist-social nist-social--envelope-white" href="https://web.archive.org/web/20240226194649/https://public.govdelivery.com/accounts/USNIST/subscriber/new"> <span>Mailing List</span> </a> </div> <div class="nist-footer__feedback"> How are we doing? 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