[daip] SNPLT hour angle plotting

[Eric Greisen]

Andy Biggs writes:
 > Hi there. I don't think SNPLT is plotting against hour angle (XAXIS=3) 
 > correctly. I have some data during which the telescopes approach the 
 > zenith. Plotting selfcal solutions for these data with XAXIS=4 (LST) shows 
 > that the LST is indeed very close to the right ascension of the source, 
 > but the hour angle is given as something close to 18H. Plotting the same 
 > data in ANBPL with BPARM=4,0 gives what appear to be correct hour angles 
 > i.e. 0H. This is present in DEC06 and DEC07.
 > 

Thanks.  There was a mysterious -PI/2 applied to the HA that was
returned from a lower level routine.  So all HAs plotted for some time
were too low by 6 hours.

Thanks,

Eric Greisen