[daip] Question about the relation between DPFU and Poly in GC table

[Cui Yuzhu]

Dear Eric,

Yes, as I change the NCOUNT, more parameters are shown.

For the relation between DPFU and Poly, I will wait for your further comments.

Thank you very much.

Best regards,
Yuzhu





> 在 2019年6月21日，00:48，Eric Greisen <egreisen at nrao.edu> 写道：
> 
> On 06/20/2019 02:38 AM, Cui Yuzhu wrote:
>> Dear Eric,
>> Thanks for your support last time.
>> Now I came across another question when I check the GC table in AIPS.
>> In APCAL task we need the Tsys information to calculate the SEFD.
>> We have two parameters at the beginning of the Tsys: DPFU and poly.
>> I thought the the *‘real DPFU’ = DPFU×Poly. *But when I change the order of these two parameters, I got different amplitude.
>> It seems the relation is not simply multiplied. I attached one file to show some results.
>> Please have a look at it when you are available.
>> Could please offer some comments on this issue?
>> Look forward to your reply.
>> Thank you so much!
>> Best regards,
>> Yuzhu
> 
> I do not know much about the GC table.  Be careful in PRTAB to set NCOUNT to for example 10.  If it is 1 then PRTAB will only show one value.  However your NTERM_1 column seems to say that there is only 1.
> 
> The GC table is provided to AIPS by the telescope/correlator and AIPS can only show what is there.  If only one term is written in the FITS-IDI file then aips will only have one term.  I will ask your questions of people who may know more about this.
> 
> Eric Greisen
> 
> 

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