AIPS HELP file for UV6TYPE in 31DEC18
As of Tue Aug 14 23:13:45 2018
Type: information only.
Information: Convolving function type 6 = Exp * BessJ1 (x) / x
Function = BESSJ1 ( ABS(U) / PARM(2) ) / ( ABS(U) / PARM(2) )
* EXP ( - ((ABS(U)/PARM(3)) ** PARM(4)) )
PARM(1) = Support size. 0 --> 3.0 cells
0 --> PARM(2) = 1.55 cells
0 --> PARM(3) = 2.52 cells
0 --> PARM(4) = 2.0
See memos by Fred Schwab for more details; large support size
may have undesired results. Changing these can put divides by
zero in the map plane and can reduce the degree of alias
suppression. See the VLA Scientific Memo Series 123, 124, 129,
and 131. See also Synthesis Imaging in Radio Astronomy, ASP
Conference Series, Volume 6, pages 130-134.
Types 6 and -6 are rectilinear (in X and Y separately), types 16
and -16 are circular (in R = sqrt(X*X+Y*Y)).
Types -6 and -16 are for single-dish use and have units of arc
seconds for PARM(1) with default = single-dish-beam_size and for
PARM(2) with default = 1.55 * single-dish-beam_size/3 and for
PARM(3) with default = 2.52 * single-dish-beam_size/3.
HORUS....Interferometer imaging with calibration, no Cleaning.
IMAGR....Interferometer imaging with calibration, Cleaning, and
MX.......Interferometer imaging with Cleaning, no calibration.
SCMAP....Interferometer imaging with Cleaning, self-calibration and
UVMAP....Interferometer imaging with no Cleaning, no calibration.
WFCLN....Interferometer imaging with Cleaning and wide-field
corrections, but no calibration.
COMPL....Plot aspects of the convolving functions.
BSGEO....Single-dish re-grid from pseudo az-el to RA-dec.
BSGRD....Single-dish continuum beam-switched imaging and correction.
SDIMG....Single-dish imaging able to do large fields (with large scratch