[daip] Re: Fwd: [HelpDesk #7037] UVGLU

[Eric Greisen]

 > ----- Begin Included Message -----
 > 
 > >From helpdesk at aoc.nrao.edu Mon Feb  3 03:48 MST 2003
 > Date: Mon, 3 Feb 2003 03:48:20 -0700
 > X-Authentication-Warning: saltmine.aoc.nrao.edu: nobody set sender to helpdesk using -f
 > From: "Thomas Greve" <tgreve at roe.ac.uk>
 > To: req-dist at saltmine.aoc.NRAO.EDU
 > Subject: [HelpDesk #7037] UVGLU
 > X-Loop: WREQ 1
 > 
 > >From: Thomas Greve <tgreve at roe.ac.uk>
 > >To: helpdesk at zia.aoc.NRAO.EDU
 > >Subject: UVGLU
 > 
 > Dear AIPS help desk,

    Please use the address daip at nrao.edu for inquiries about AIPS.
 > 
 >  I have a problem when trying to UVGLU adjacent
 > spectral channels. The UVGLU goes well but when
 > I try and IMAGR the result it looks crazy.

    "crazy" is not well defined - what do you mean?

 > 
 > Are you supposed to UVGLU before you flag and calibrate
 > the data? The help on UVGLU doesn't mention anything about that.

     No - in general one calibrates and flags the separate IFs or
whatever they are first.

 > 
 > this is what I do:
 > 
 >         task 'uvglu'; default
 >         inname '4C60N1_20_46'
 >         inclass 'UV'
 >         inseq 0
 >         indi 3
 >         in2name '4C60N1_12_24'
 >         in2class 'UV'
 >         in2seq 0
 >         in2disk 3
 >         outname '4C60N1_C_46'
 >         outclass 'UV'
 >         outseq 0
 >         outdisk 3
 >         go

    I have no idea what telescope you have used or what your data look
like.  Please send IMHEADER outputs from all three data sets above

 > 
 > 	task 'imagr'; default
 >         indi 3; getn 25
 >         outname '4C60N1_C_46'
 >         outdisk 3
 >         bif 0; eif 0
 >         bchan 0; echan 0
 >         npoints 3
 >         chinc 0

     This requests a spectral-line output where 3 channels are
"averaged" as channels 1-3 into output channel 1, channels 2-4 into 2,
channels 3-5 into 3, and so on.

 >         stokes 'I'
 >         cellsize 0.2
 >         imsize 1024
 >         uvtaper 0
 >         robust 5
 >         cmethod 'DFT'
 > 	go

Eric Greisen