[daip] Fitted beam flux issues

[Eric Greisen]

The measurement of flux on a Clean image is more or less a linear
process so the difference you are seeing is from the residual image.
The Clean Components have a fixed flux independent of the restoring
beam and IMEAN or whatever you are using to integrate flux will get
back whatever was put in.  The residual however was observed on a
Jy/beam scale for a beam that is poorly defined but something like the
beam that IMAGR fits to the central peak.  If you use a restoring beam
substantially different than this in area then the residual should be
rescaled before the components are added back.  There is an obscure
option in IMAGR to do this which I suspect you (and everyone else)
have not used.  In the absence of the rescaling the "flux" of the
residual will appear to be changeed by the size of the restoring beam.
The fact that you get the "right" flux with the "wrong" beam is an
accident.  Interferometers do not measure flux well and getting back
what you put in is a chancy business unless you have simple point
sources with no noise.

Eric Greisen