AIPS HELP file for GWIDTH in 31DEC19
As of Tue Dec 11 23:04:50 2018
Type: Adverb (Real(3,4))
Use: An array, dimension (3,4), containing the initial guess
of the (Major axis, Minor axis, Position angle) of the
component. The units are (pixels, pixels,degrees).
For 1 dimensional fitting only the first row is used and
the units are determined by LTYPE.
Null Value: 0
Null value means take the clean beam as the first guess.
If no beam is available use a circular 2-pixel diameter