[daip] synthesized beam area

[Gary A. Welch]

Dear Aips Helper,

Task BLSUM outputs mean flux per beam in the blotch region (I'm using a dirty 
cube).  I want to convert to total flux in the blotch region.  So I need a good 
value for the "beam area" used by BLSUM.  

The only info which seems potentially useful are the values of "Conv size" in 
the image header.  Is the "beam area" just the area of the ellipse defined by 
those two values?  Is there a better way?

Gary Welch