[daip] CLCOR gain curves.

[Craig Walker]

This is a suggestion (previously made orally) to make it clear in the 
DAIP help file that the gain curve invoked by OPCODE='GAIN' is a voltage 
gain.  It directly multiplies the CL entries.  Most gain curves 
distributed by observatories, I suspect, are power gains.  That is 
certainly true for the VLBA.  Thus someone trying to apply such a curve 
has to be careful.  In fact, the concept of taking the square root of a 
polynomial is sufficiently messy that it would be useful to have a 
separate OPCODE for power gains.

Note that OPCODE='GAIN' is also, as far as I can tell, the easiest 
option to use if you just want to scale your data by a constant.  I ran 
into the voltage vs power issue when I tried to do that to compensate 
for some other calibration issues.

Cheers,

Craig

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     R. Craig Walker            Array Operations Center
     cwalker at nrao.edu           National Radio Astronomy Observatory
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