[daip] Re: aips question

[Eric Greisen]

Tracy Clarke (Contractor) writes:
 >  	I'm working with some GMRT data and am a bit confused about how 
 > polarizations work in AIPS. Specifically, the GMRT data come as both 
 > stokes RR in separate files and I wanted to add the two files togather as 
 > RR and LL for calibration. I tried just setting the stokes flag to -2 on 
 > one of them and then running DBCON but that gave me the message that
 > STOKES RANGES DO NOT OVERLAP
 > 
 > I also get the same message if I run FXPOL on each and then try dbcon. I 
 > guess that there must be something more I am missing. I took an old uv 
 > file i had and ran split to take off the RR and LL then tried dbcon and 
 > also get the same error message. Could you tell me how I can add these 
 > data sets and what parameters I need to be careful to set properly? 

Polarizations are treated as part of an array and cannot be put back
together once they are torn asunder.  Your best bet is just, run UVFIX
first and then DBCON with 5 days added to one and then calibrate
separately.

Eric Greisen