[daip] Requested change to IMAGR

[Lincoln]

Hi Eric,

We would like to get your feedback about a possible generalization of 
how clean boxes are set in IMAGR.  We have a large VLBI project that would 
benefit greatly if something can be arranged in the near term.

As Lynn and Claire have probably described in the past, we are attempting 
to map (VLBI) the Orion SiO maser with high dynamic range.  Our images 
do not deconvolve well because of
the nearly zero declination and bright complex source structure.


To obtain images w/ minimal artifacts for (the many) spectral channels 
that contain strong emission centers, we use clean boxes.  Because the 
locations of the emission centers change substantially from 
low to high sky frequency, it can be difficult to make high quality image 
cubes unless we map small ranges of channels and change the clean boxes 
between ranges.

Would it be possible to have IMAGR equipped so that the user can specify 
clean boxes that are indexed by channel in some way?  One possibility 
might be an optional mode in which IMAGR reads 
MYAREA:BOXFILE.channelnumber when it starts to clean a particular channel. 
I thought of this solution as a minimum effort one, but that was a guess - 
I do not understand the inner workings of IMAGR.

Best,
Lincoln




-- 
Lincoln J. Greenhill               Smithsonian Astrophysical Observatory
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