<font face="Verdana, Arial, Helvetica" size="2">problems with 31DEC19 AIPS version<br />
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<div style="margin-left: 40px;">Ticket ID: 15791</div>
<div style="margin-left: 40px;">URL: <a href="https://help.nrao.edu/staff/index.php?/Tickets/Ticket/View/15791">https://help.nrao.edu/staff/index.php?/Tickets/Ticket/View/15791</a></div>
<div style="margin-left: 40px;">Name: Cristina Romero-Canizales</div>
<div style="margin-left: 40px;">Email address: <a href="mailto:cristina.rocc@gmail.com">cristina.rocc@gmail.com</a></div>
<div style="margin-left: 40px;">Creator: User</div>
<div style="margin-left: 40px;">Department: AIPS Data Reduction</div>
<div style="margin-left: 40px;">Staff (Owner): Eric Greisen</div>
<div style="margin-left: 40px;">Type: Issue</div>
<div style="margin-left: 40px;">Status: Open</div>
<div style="margin-left: 40px;">Priority: Default</div>
<div style="margin-left: 40px;">SLA: NRAO E2E</div>
<div style="margin-left: 40px;">Template group: Default</div>
<div style="margin-left: 40px;">Created: 26 February 2020 09:16 AM</div>
<div style="margin-left: 40px;">Updated: 27 February 2020 07:50 AM</div>
<div style="margin-left: 40px;">Reply due: 02 March 2020 07:51 AM (4d 0h 0m)</div>
<div style="margin-left: 40px;">Resolution due: 22 November 2022 12:00 AM (998d 16h 9m)</div>
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Dear Eric,<br />
<br />
As I mentioned in the ticket, I repeated the same steps I made in the data<br />
reduction using 31DEC12, both in 31DEC17 and 31DEC19, and this last one I<br />
did it in two different computers. Only in 31DEC19 I found the problems I<br />
described in my ticket. I verified that the results from PRTAN and LISTR<br />
OPTY 'SCAN' were exactly the same.<br />
<br />
I made some more tests, following the advice in your first message. In<br />
31DEC19 I loaded the data again with FILLM and used UVPLT with BPARM=0 for<br />
the target NGC3393. The plot shows a maximum baseline of 600 kilo Lambda<br />
(see attachment UVPLT_ORIG.png). I run UVPLT again after applying UVFIX,<br />
since I wanted the coordinates in J2000. I attach the plot<br />
(UVPLT_UVFIX.png) where you can see that the maximum baseline goes above<br />
120 Mega Lambda. Doing exactly the same in 31DEC17, there is no change in<br />
the scale: it goes from 600 kilo Lanbda to 600 kilo Lambda after UVFIX.<br />
<br />
I checked the explain sections for UVFIX in both 31DEC17 and 31DEC19 and<br />
they seem to be the same, so I assumed there is no change in the<br />
parameters. I also didn't find any record for UVFIX in<br />
<a href="http://www.aips.nrao.edu/index.shtml" target="_blank">http://www.aips.nrao.edu/index.shtml</a><br />
<br />
The behaviour of UVFIX would explain the problem with IMAGR. About the<br />
calibration, I still don't have an answer.<br />
<br />
Could it be that 31DEC20 is not exactly identical to 31DEC19?<br />
<br />
Best regards,<br />
Cristina.<br />
<br />
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