{"id":12171,"date":"2021-07-20T23:05:08","date_gmt":"2021-07-21T09:05:08","guid":{"rendered":"http:\/\/www.eaobservatory.org\/jcmt\/?p=12171"},"modified":"2021-07-20T23:05:08","modified_gmt":"2021-07-21T09:05:08","slug":"kappa-pol2map-bug-causes-incorrect-variances-and-error-values","status":"publish","type":"post","link":"https:\/\/www.eaobservatory.org\/jcmt\/2021\/07\/kappa-pol2map-bug-causes-incorrect-variances-and-error-values\/","title":{"rendered":"KAPPA\/POL2MAP bug causes incorrect variances and error values"},"content":{"rendered":"<p>A bug was introduced into the <span style=\"font-family: 'courier new', courier, monospace\">cmult<\/span> and <span style=\"font-family: 'courier new', courier, monospace\">cdiv<\/span> commands in the Starlink KAPPA package on 21st May 2021. This bug caused incorrect Variance values to be stored in the output and was fixed on 12th July 2021. Consequently, anyone who uses these commands and who last rsynced the nightly Starlink build from EAO between these dates should consider rsyncing the current nightly build, which includes the bug fix.<\/p>\n<p>POL2 users should be aware that the <span style=\"font-family: 'courier new', courier, monospace\">cmult<\/span> command is used within the <span style=\"font-family: 'courier new', courier, monospace\">pol2map<\/span> script when converting values from pW to mJy\/beam. This means that vector catalogues produced by <span style=\"font-family: 'courier new', courier, monospace\">pol2map<\/span> will contain incorrect DI\/DQ\/DU values if starlink was rsynced between the two dates mentioned above.\u00a0 Again, the solution is to rsync the current nightly build, which includes the bug fix.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A bug was introduced into the cmult and cdiv commands in the Starlink KAPPA package on 21st May 2021. This bug caused incorrect Variance values to be stored in the output and was fixed on 12th July 2021. Consequently, anyone who uses these commands and who last rsynced the nightly\u2026 <a class=\"continue-reading-link\" href=\"https:\/\/www.eaobservatory.org\/jcmt\/2021\/07\/kappa-pol2map-bug-causes-incorrect-variances-and-error-values\/\">Continue reading<\/a><\/p>\n","protected":false},"author":13,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[36],"tags":[48,37,47,24],"_links":{"self":[{"href":"https:\/\/www.eaobservatory.org\/jcmt\/wp-json\/wp\/v2\/posts\/12171"}],"collection":[{"href":"https:\/\/www.eaobservatory.org\/jcmt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.eaobservatory.org\/jcmt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.eaobservatory.org\/jcmt\/wp-json\/wp\/v2\/users\/13"}],"replies":[{"embeddable":true,"href":"https:\/\/www.eaobservatory.org\/jcmt\/wp-json\/wp\/v2\/comments?post=12171"}],"version-history":[{"count":1,"href":"https:\/\/www.eaobservatory.org\/jcmt\/wp-json\/wp\/v2\/posts\/12171\/revisions"}],"predecessor-version":[{"id":12172,"href":"https:\/\/www.eaobservatory.org\/jcmt\/wp-json\/wp\/v2\/posts\/12171\/revisions\/12172"}],"wp:attachment":[{"href":"https:\/\/www.eaobservatory.org\/jcmt\/wp-json\/wp\/v2\/media?parent=12171"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.eaobservatory.org\/jcmt\/wp-json\/wp\/v2\/categories?post=12171"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.eaobservatory.org\/jcmt\/wp-json\/wp\/v2\/tags?post=12171"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}