AIPS HELP file for DO3DIMAG in 31DEC18
As of Mon Jun 18 14:57:19 2018
Type: Adverb (scalar)
Use: To specify whether a data set is imaged with "3-dimensional"
techniques. True means to make each facet tangent to the
celestial sphere at its center. False means to make each facet
tangent to the celestial sphere at the phase-stopping
coordinate even when that point is not within the facet.
Beginning about May 1, 2009, the code for false is implemented
by a technique which has been described as "u-v plane faceting"
which corrects for 3D effects rather better than the previous
code. True seems still to produce better images but the
difference is now marginal. The cost to compute either true or
false imaging is about the same.
Null value: 0
Taken to mean false.
IMAGR........Fourier transforms and Cleans uv data with wide-field,
interactive TV, and data weighting options.