[daip] two problems with POSSM

[Elias Brinks]

Dear Eric,

I stumbled upon two annoying problems with POSSM when plotting the BP  
table:

- suppose you have a data set with a bandpass calibrator at the  
beginning and at the end.
Also, suppose everything is rock-solid stable and you create a single  
solution in BPASS
using SOLINT=-1; in that case POSSM doesn't plot the resulting BP  
table. A PRTAB
shows nothing untoward. Also, BPLOT does the trick (but is less fancy).

Using SOLINT = 0 and creating then 2 entries in the BP table will work  
fine, POSSM in
that case plotting two sets of graphs, one set for the first  
observation on the calibrator
and another for the second.

- now, POSSM only does this correctly if you specify the same  
calibrator name in
SOURCES as you used for CALSOUR in BPASS. If you run POSSM with SOURCE  
' ',
you will get a lot of error messages related to the times in between  
the two scans on the
bandpass calibrator.

Neither of this is critical, but it's a tricky feature that could trip  
someone up. It took me a
while to convince myself that the BP table BPASS created was indeed  
fine.

I can provide a data set for you if you can't easily reproduce these  
effects.

Thanks for looking into this.

Cheers,

Elias