<div dir="ltr">Hi Leonid,<div><br></div><div>Thanks for pointing me to the documentation! I'm hoping to compare visibilities from my correlation pipeline to the output from DiFX.</div><div><br></div><div>Best,</div><div> Rebecca </div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, 28 Aug 2021 at 13:16, Leonid Petrov <<a href="mailto:Leonid.Petrov@lpetrov.net">Leonid.Petrov@lpetrov.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Rebeca,<br>
<br>
> I'm wondering if there is documentation on how information is stored in the<br>
> fits file <br>
<br>
Sure:<br>
<br>
<a href="ftp://ftp.aoc.nrao.edu/pub/software/aips/TEXT/PUBL/AIPSMEM114.PDF" rel="noreferrer" target="_blank">ftp://ftp.aoc.nrao.edu/pub/software/aips/TEXT/PUBL/AIPSMEM114.PDF</a><br>
<br>
> and how to plot the visibilities. <br>
<br>
Usually, these plots are useless. There are exceptions, but generally,<br>
you need process the data first to see any signal. You can develop your<br>
own software for visibility analysis or try to use existing packages, <br>
whichever you prefer. But it is not easy. Depending on the problem, <br>
mastering data analysis may take from months (though this sounds<br>
very optimistic) till ... all your life. Good luck.<br>
<br>
> I'm mainly wondering where the<br>
> complex visibilities are stored in the fits file.<br>
<br>
In section UV_DATA. See AIPSMEM114.PDF for details.<br>
<br>
Leonid<br>
2021.08.28_13:09:41<br>
</blockquote></div>