AIPS HELP file for WEIGHTIT in 31DEC18
As of Sat Jun 23 11:33:34 2018
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
CALIB.....determines antenna calibration: complex gain
FRING.....fringe fit data to determine antenna calibration, delay,
KRING.....fringe fit data to determine antenna calibration, delay,