[daip] [!6569]: AIPS - questions about DOSCALE, SPECINDX in BPASS

[Lynn Matthews]

Lynn Matthews updated #6569
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questions about DOSCALE, SPECINDX in BPASS
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           Ticket ID: 6569
                 URL: https://help.nrao.edu/staff/index.php?/Tickets/Ticket/View/6569



I have an observation where I had to use a non-standard source as BP calibrator. 
I'm not convinced that I really understand what BPASS is doing with various 
combinations of DOSCALE and SPECINDX.

As I interpret the HELP file, DOSCALE in BPASS should indicate the following: 
DOSCALE= -1 ==> ignore spectral index
DOSCALE= 0 or 1 ==> take known value for know source; fit unknown sources from SU table
DOSCALE=2 ==> fit unknown sources, including curvature term (also fit if known source?)

I did several tests for a data set with 3C48 as the BP calibrator, all with BPASSPRM(10)=0 
to suppress normalization, and I'm confused by the results. They are attached as an ascii table.

Let me know if the table results are unclear.

Thanks,
Lynn

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