[daip] Re: question about multi-freq data

[Hiroko Shinnaga]

Let me add one more thing.  The CH0 data which I'm
dealing was created  via 'fillm' with cparm(7)= 0 instead of
cparm(7)=-1 .  (Aips cookbook says one has to use fillm
with cparm(7)=-1 . )  So, do I need to create the file using
fillm with setting the cparm(7)=-1 to calibrate each frequency
separately?  I'd like to appreciate your response.  Thanks a lot.

 -Hiroko

Hiroko Shinnaga wrote:

> Hello,
>
>   I have a question about dealing with multi-frequency data.
> I have a multi-freq (two frequencies) data in my disk.
>
>    The cookbook says that each frequency must be calibrated
> separately.   I'd like to know How I can calibrate them
> separately.  Should I have to have two separate files for each
> calibration?  Or one can calibrate those two frequency data
> separately by setting the parameter "FREQID" of vlacalib
> using just one CH0 file?
>    The cookbook also says that when reading with such
> multiple data, one can use fillm and set cparm(7)=-1.
> However, since I had downloaded the data file via ftp, I didn't
> need to use 'fillm'.  To deal with multi-frequency data,
> is it necessary to use 'fillm' to create two files for each
> frequency or can I just go ahead calibrate each frequency
> using one CH0 file which includes both frequencies?
>
>   I'd like to appreciate your response.  Thanks a lot.
>
>  -Hiroko

--
_____________________________________________________________________
Hiroko Shinnaga        Postdoctoral Research Fellow
Harvard-Smithsonian Center for Astrophysics,  Sub-Millimeter Array
Address:  82 Pu'uhonu Pl., Suite 210, Hilo, HI 96720 USA
Phone:   +1-808-933-8133 / Fax: +1-808-933-6948
Web: http://cfa-www.harvard.edu/~hshinnaga
_____________________________________________________________________