AIPS HELP file for WEIGHTIT in 31DEC22
As of Mon Jan 30 0:34:14 2023
Type: Adverb (scalar)
Use: A code controlling the modification of data weights prior to
their use in gain solutions and fringe fitting. Weighting by
uncertainty squared may be too extreme a method, down-weighting
outer antennas excessively and producing failed solutions.
Weighting linearly by uncertainty may be more stable.
0 - no change weighting by 1/sigma**2
1 - sqrt (wt) weighting by 1/sigma may be more stable
2 - (wt)**0.25 weighting by 1/sqrt(sigma)
3 - wt -> 1.0 no weighting
Null value: 0
BPASS.....Computes spectral bandpass correction table
BPWGT.....Calibrates data and scales weights by bandpass correction.
WEIGHTIT selects the bandpass, its square root, or its
CALIB.....Determines antenna calibration: complex gain
DGAUS.........Correct UV model for convolution by Clean beam
FLATN.....Re-grid multiple fields into one image incl sensitivity.
WEIGHTIT is used to down-weight outer pixels in each
FRING.....Fringe fit data to determine antenna calibration, delay,
KRING.....Fringe fit data to determine antenna calibration, delay,
OMFIT.....Fits sources and, optionally, a self-cal model to uv data.
IMFRING...Large image delay fitting with IM2CC and OOFRING.
IMSCAL....Large image self-cal with IM2CC and OOCAL
OOCAL.....Determines antenna complex gain with frequency-dependent
OOFRING...Fringe fit data to determine calibration with spectral
PEELR.....Calibrates interfering sources in multi-facet imges.