[evlatests] Some Good WIDAR news

[Eric Greisen]

BPASS in AIPS divides the data by a model computed correctly at each 
channel.  If I understand correctly, Rick ran BPASS averaging the 
divided data over all times (6+ hours) to make a basic BP table. 
Applying just that table results in no symmetrization.  Then Rick 
averaged up some channels and ran BPASS again, asking for solutions 
every 15 sec.  It is only at this point that he began to see some 
strange symmetrical things.  User error - including averaging too many 
channels - is what Rick suspects is the cause.  Exactly what error 
remains to be elucidated.

But it is not BPASS making a gross fundamental error.  Note that if 
BPASS got it wrong then all other aips tasks would also have it wrong - 
IMAGR, CALIB, etc etc

Eric Greisen