[daip] CLCOR vs IMAGR for shifts

[Eric Greisen]

I do not have completely suitable data to test your issue but I tried 
anyway - C array at L band.  I shifted north by 15 arc minutes.  This is 
about the same as yours - to the half power point of the beam.  Then 
with DOCAL=1 and DECSH=-900, I ran IMAGR.  The point source looked sort 
of okay but it did not Clean down to the other sources in the field and 
was not "right".  I then ran UVFIX.  Running the same IMAGR, but now on 
the fixed data, produced normal - i.e. right - results.

A array would have made all this worse.

Note that UVFIX has a coordinate shift option and some discussion about 
its use in the help file.

Eric Greisen