<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Hi All,<div class=""><br class=""></div><div class="">You probably received this from Willem directly (if you’re on the “Everyone” pulsars mailing list), but if not… then “FYI".</div><div class=""><br class=""></div><div class="">Cheers,</div><div class=""><br class=""></div><div class="">Jason</div><div class=""><br class=""><div class="">
<div dir="auto" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div dir="auto" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div dir="auto" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;">-----<br class=""><br class="">Dr. Jason W. T. Hessels<br class=""><br class="">Chief Astronomer - ASTRON, Netherlands Institute for Radio Astronomy<br class="">Associate Professor (Universitair Hoofddocent) - University of Amsterdam<br class="">Member De Jonge Akademie - <a href="http://dejongeakademie.nl" class="">dejongeakademie.nl</a></div><div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;">Mobile Tel: +31 (0)610260062</div><div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><br class=""></div></div></div></div></div></div><div><blockquote type="cite" class=""><div class="">Begin forwarded message:</div><br class="Apple-interchange-newline"><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;" class=""><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(0, 0, 0, 1.0);" class=""><b class="">From: </b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;" class="">Willem van Straten <<a href="mailto:vanstraten.willem@gmail.com" class="">vanstraten.willem@gmail.com</a>><br class=""></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;" class=""><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(0, 0, 0, 1.0);" class=""><b class="">Subject: </b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;" class=""><b class="">[Everyone] PSRCHIVE bug: PSRFITS data systematically attenuated</b><br class=""></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;" class=""><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(0, 0, 0, 1.0);" class=""><b class="">Date: </b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;" class="">15 December 2020 at 10:25:41 CET<br class=""></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;" class=""><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(0, 0, 0, 1.0);" class=""><b class="">To: </b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;" class=""><a href="mailto:psrchive-users@lists.sourceforge.net" class="">psrchive-users@lists.sourceforge.net</a>, <a href="mailto:psrchive-developers@lists.sourceforge.net" class="">psrchive-developers@lists.sourceforge.net</a>, <a href="mailto:everyone@lists.pulsarastronomy.net" class="">everyone@lists.pulsarastronomy.net</a><br class=""></span></div><br class=""><div class=""><meta http-equiv="Content-Type" content="text/html; charset=utf-8" class=""><div dir="ltr" class="">Hi everyone,<div class=""><br class=""></div><div class="">Today, I checked in a couple of PSRCHIVE bug fixes that may have a small impact on your data. These bugs are relevant only to PSRFITS file I/O.</div><div class=""><br class=""></div><div class="">1. To date, when writing data to a PSRFITS file, PSRCHIVE has been converting floating point values to signed 16-bit integers by truncation (casting as opposed to rounding). This has the effect of systematically decreasing the range of values in the data (e.g. -1.999 is truncated to -1 and +1.999 is truncated to +1).</div><div class=""><br class=""></div><div class="">2. Since April 2016, when writing data to a PSRFITS file, PSRCHIVE has effectively been using only 15 of the 16 bits, which effectively doubles the rounding error.</div><div class=""><br class=""></div><div class="">You can read more about these errors and the bug fixes at</div><div class=""><br class=""></div><div class=""><a href="https://eur04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fsourceforge.net%2Fp%2Fpsrchive%2Fbugs%2F440%2F&data=04%7C01%7Cj.w.t.hessels%40uva.nl%7C0258a5613a84499201a708d8a0dbaf2e%7Ca0f1cacd618c4403b94576fb3d6874e5%7C1%7C0%7C637436212679586564%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=JOANpkfi1BRfwapcwZC4cZX5hfvOs%2FQNTm03tfnWXk8%3D&reserved=0" originalsrc="https://sourceforge.net/p/psrchive/bugs/440/" shash="oiLTE2IYLuxjyq+EonG+pp6o/g8X4HDl5cPBsyFvR8p0en2khSpRiXS9yazwoqh0X/fRpQmzGqhHdTVQCLVSpJC/5Rg6UAi6ufF61TJeCR5AfjKVcVRy3jossBndzXPwJ6Tw3Rt3+iyh3WkaSJCMmlObLSlvmJKpmVHrrQdkPeY=" class="">https://sourceforge.net/p/psrchive/bugs/440/</a><br class=""></div><div class=""><br class=""></div><div class="">Please update your PSRCHIVE installation and let everyone know if you discover any issues that are greater than those encountered so far (described at the above link).</div><div class=""><br class=""></div><div class="">Cheers,</div><div class="">Willem</div><div class=""><br class=""></div></div>
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