[From nobody Thu Jul 24 13:44:08 2014
Message-ID: <4829F4EF.1060505@nrao.edu>
Date: Tue, 13 May 2008 14:07:11 -0600
From: Leonia Kogan <lkogan@nrao.edu>
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To: Hiroko Shinnaga <shinnaga@submm.caltech.edu>
Subject: Re: [daip] questions regarding prtan and imagr
References: <9CF06EEC-DD5A-4885-8EE6-1F26B572D3A1@caltech.edu>
In-Reply-To: <9CF06EEC-DD5A-4885-8EE6-1F26B572D3A1@caltech.edu>
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Hiroko,

The main person of AIPS Eric is not at the office now. So I'll try to 
answer you something.

Q1

>When I inspect the data using the task "UVPLT"
>for example, it looks like it contains all data of all baselines. 

Yes the data include probably all baselines.
UVPLT plots the UV data and does not use AN table at all.
I think your AN table is actually corrupted. I do not know MIR(IDL).
So I do not know why the AN table is wrong. 

Generally speaking AN table is used at the calibration (at AIPS). So if you used 
the AN table at MIR(IDL) your calibration could miss the 2 antennas depending on your
input parameters.

In AIPS AN table is created by the task FITLD

Q2

IMAGR does not use AN table at all

So all your problems are at the beginning: outside of AIPS !!!

Leonid Kogan


Hiroko Shinnaga wrote:
> Dear AIPS experts,
>
>    I'm Hiroko Shinnaga, a staff scientist at the Caltech Submillimeter
> Observatory.  I have two general questions regarding tasks of PRTAN
> and IMAGR.
>
> Q1.   I'm dealing with some interferometric data that contains
> 10 antennas in total.  I first create FITS file using a calibration tool
> called MIR (IDL base) and generated a FITS file.  Then I read the
> FITS file to AIPS.  When I inspect the data using the task "UVPLT"
> for example, it looks like it contains all data of all baselines.   
> However,
> when I use the "PRTAN", I see only information of 8 antennas.  From
> the output of "PRTAN", it seems the antenna table seemed to not be
> transfered properly.  Could you let me know what kind of effect I
> should expect if I don't have a correct antenna table?
>
> Q2.  When I tried to process the above image with IMAGR, I found
> I was able to make sensible image only when I use UVWTFN = ' '
> (uniform weighting).  Does this indicate that something may be
> wrong for the table that contains weighting information of each antenna?
>
>    Hope to hear from you.  Thanks very much.
>
> Hiroko
>
>
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