[daip] JMFIT deconvolution

[Eric Greisen]

Rob Ivison wrote:
> hi Eric -
> 
> any chance you could explain a little more clearly what the extreme 
> values returned for deconvolved size by JMFIT actually mean? i found the 
> following explanation (from the explain file) difficult to fathom...
> 
> DECONVOLUTION:
>      When fitting to a clean map, JMFIT deconvolves the clean beam
> from the fitted component size.  The nominal deconvolution is obtained
> by deconvolving the fit from the clean beam.  A value of 0.0 means
> that the source is smaller than the clean beam in some dimension.  The
> minimum and maximum values are obtained by deconvolving the source
> beam parameters with all combinations of 0.7 * error and listing the
> extreme values.

Actually this help is slightly wrong.  The task tries deconvolutions at 
the nominal solution.  It then goes over all 27 possible combinations of 
adding or subtracting 1 sigma in the fit size parameters and records the 
maximum and minimum found for the major axis, minor axis, and position 
angle.  It displays the nominal solution and these extrema.

Eric Greisen