<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div dir="ltr" style="-webkit-text-size-adjust: auto;">Regarding known errors in the FITS Standard document, I think an Errata page should be placed online until such time as a new version of the document can be produced. Here are 3 items I know of:</div><div dir="ltr" style="-webkit-text-size-adjust: auto;"><br></div><div dir="ltr" style="-webkit-text-size-adjust: auto;"><i>1. S</i><span style="background-color: rgb(255, 255, 255);">ection 10.1.3: This sentence “If</span><span style="background-color: rgb(255, 255, 255);"> the heap is larger than 2.1 GB, then the ‘1Q’ format (which uses 64-bit pointers) must be used.” is incorrect because the ‘1P’ format can also produce a heap that is larger than 2.1 GB. See my email to fitsbits on 26 Oct 2023 for a suggested rewording of this section. </span><br><div dir="ltr"><div dir="ltr"><div dir="ltr"><br></div><div dir="ltr">2. Section 10.2.1: In the sentence "... <i>pixels in the floating-point image that are exactly equal to 0.0 are represented by the reserved value -<span dir="ltr" style="color: blue; text-decoration: underline;">2147483647</span> in the quantized integer array...</i>", the reserved value should be -<i><span dir="ltr" style="color: blue; text-decoration: underline;">2147483646</span>.</i></div><div dir="ltr"><br></div><div dir="ltr"><span style="background-color: rgb(255, 255, 255);">3. Section 10.3.6: In the recipe for compressing variable-length array columns, the sentence that says append one set of variable-length array descriptors after another set is backwards. The 2 sets should be combined in the opposite order. </span></div><div dir="ltr"><span style="background-color: rgb(255, 255, 255);"><br></span></div><div dir="ltr"><span style="background-color: rgb(255, 255, 255);"><br></span></div><div dir="ltr"><span style="background-color: rgb(255, 255, 255);">Does anyone know of any other errors or any sections in the Standard that need clarification?</span></div><div dir="ltr"><span style="background-color: rgb(255, 255, 255);"><br></span></div><div dir="ltr"><span style="background-color: rgb(255, 255, 255);">Bill</span></div><div dir="ltr"><br><blockquote type="cite">On Mar 28, 2024, at 1:05 PM, Pierre Fernique via fitsbits <<span dir="ltr" style="color: blue; text-decoration: underline;">fitsbits@listmgr.nrao.edu</span>> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><p><br></p><p>Hi all,<br></p><div class="moz-cite-prefix">Le 28/03/2024 à 00:43, Seaman, Robert Lewis - (rseaman) via fitsbits a écrit :<br></div><blockquote type="cite" cite="mid:SA3PR19MB8165976B66C4594A2F94714AA7342@SA3PR19MB8165.namprd19.prod.outlook.com"><div class="WordSection1" style="page: WordSection1;"><p class="MsoNormal" style="margin: 0in; font-size: 11pt; font-family: Calibri, sans-serif;">Does Rubin have any other suggestions for updating the standard? By all means make a list. The standard is not frozen, even if the procedures may be a bit quaint.<o:p></o:p></p><p class="MsoNormal" style="margin: 0in; font-size: 11pt; font-family: Calibri, sans-serif;"><o:p> </o:p></p><p class="MsoNormal" style="margin: 0in; font-size: 11pt; font-family: Calibri, sans-serif;">Rob</p></div></blockquote><p>As the standard is not frozen 😉, I'd like to take this opportunity to recall the following discrepancies raised one year ago between the current description of the RICE decompression method in the standard (4.0), and the actual implementation in the latest version of CFITSIO (see below for details).</p><p>More generally, regarding the easiness / difficulty of implementing the new document's recommendations, it would be interesting to know which alternative libraries to CFITSIO have already partially or fully implemented the document compression/decompression recommendations. A new column in the table described here <a class="moz-txt-link-freetext" href="https://fits.gsfc.nasa.gov/fits_libraries.html" style="color: blue;">https://fits.gsfc.nasa.gov/fits_libraries.html</a> would be very valuable for evaluating this question.<br></p>Best regards,<br>Pierre Fernique<br><p><br></p></div></blockquote></div></div></div><br class="Apple-interchange-newline" style="-webkit-text-size-adjust: auto;"><div dir="ltr"></div></body></html>