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<p>Dear Eric Greisen,</p>
<p><br>
</p>
<p>Thank you very much for your suggestion. Using AIPS software is really challenge for me. I never have any chance to have in-person training or workshop before, and the best thing I can do is consulting with some specialists remotely. If I have more chance
to continue my job in this area, I will try to attend to NRAO data reduction workshop which will be held next year so my skill in this software will be improved.</p>
<p><br>
</p>
<p>Yours sincerely,</p>
<p>Jedsada Maklai</p>
<p><i><span style="color:rgb(0,111,201)">Research Assistant (by Dr. Ram Kaesh Yadav)</span></i></p>
<p><i><span style="color:rgb(0,111,201)">National Astronomical Research Institute of Thailand (NARIT)</span></i><br>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Eric Greisen <egreisen@nrao.edu><br>
<b>Sent:</b> Monday, July 17, 2023 10:58:11 PM<br>
<b>To:</b> Jedsada Maklai<br>
<b>Cc:</b> daip@nrao.edu; Ram Kesh Yadav<br>
<b>Subject:</b> Re: [daip] Question about using AIPS for radio image synthesis {External}</font>
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<div class="PlainText">CLINT is the interval between values in the CL table. If the calibration<br>
varies rapidly with time, then it should be shorter than 1 minute. At<br>
your<br>
frequency, the default or 1.05 should be fine. The reason to use QUACK is<br>
that on some systems the first first data record or two or three are<br>
affected by scan startup issues and have incorrect amplitude or phase<br>
compared to the rest. Do not use QUACK until you have examined calibrator<br>
source data in detail to see if there are issues at the start and end of<br>
scans. That examination will show you what values to use for QUACK if<br>
any.<br>
<br>
Eric Greisen<br>
<br>
<br>
> Dear NRAO staffs,<br>
><br>
><br>
> Now I am doing task QUACK. However, I don't know what the values of APARM<br>
> in it should be. I will do the cutting at the beginning of each scan, is<br>
> it enough? Or should I do the cutting at the end of each scan also? The<br>
> attached file shows the scan data which I retrieve from task LISTR.<br>
><br>
><br>
> Could you mind explain how to do the decision about it also, please?<br>
><br>
><br>
> Yours sincerely,<br>
><br>
> Jedsada Maklai<br>
><br>
> Research Assistant (by Dr. Ram Kesh Yadav)<br>
><br>
> National Astronomical Research Institute of Thailand (NARIT)<br>
><br>
><br>
> ________________________________<br>
> From: Jedsada Maklai<br>
> Sent: Monday, July 17, 2023 10:20:01 AM<br>
> To: daip@nrao.edu<br>
> Cc: Ram Kesh Yadav<br>
> Subject: Question about using AIPS for radio image synthesis<br>
><br>
><br>
> Dear NRAO staffs,<br>
><br>
><br>
> I'm using AIPS in order to do the image synthesis. It is radio continuum<br>
> data from GMRT observation at 1260 MHz.<br>
><br>
><br>
> The question is, in task FITLD, what is the suitable value for CLINT<br>
> parameter? and why? What is the criteria for justifying the suitable value<br>
> of CLINT in general?<br>
><br>
><br>
> (Someone used to suggest me that the suitable value should be 1.05 but I<br>
> don't know the reason. My professor said I should know the reason behind<br>
> this also so I will be able to apply it to other observations in the<br>
> future.)<br>
><br>
><br>
> So, could you mind explain it to me, please?<br>
><br>
><br>
> Yours sincerely,<br>
><br>
> Jedsada Maklai<br>
><br>
> Research Assistant (by Dr. Ram Kesh Yadav)<br>
><br>
> National Astronomical Research Institute of Thailand (NARIT)<br>
> _______________________________________________<br>
> Daip mailing list<br>
> Daip@listmgr.nrao.edu<br>
> <a href="https://listmgr.nrao.edu/mailman/listinfo/daip">https://listmgr.nrao.edu/mailman/listinfo/daip</a><br>
><br>
<br>
<br>
Eric W Greisen<br>
<br>
<br>
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