AIPS HELP file for NCHAV in 31DEC19
As of Thu Dec 13 13:35:17 2018
Type: Adverb (scalar)
Use: To specify the number of channels (usually spectral channels) to
be "averaged" together in some operation. Note that imaging
programs "average" channels by gridding them separately into the
same output image using the u,v,w's corrected for each channel
Null value: 0
IMAGR......Converts visibility data into images, performing
deconvolutions as desired. NCHAV specifies the number of
spectral channels contributing to each output image.
SPLIT......Applies calibration and flagging to multi-source
visibility data, producing single-source data files.
NCHAV is the number of input spectral channels averaged
(in the usual sense) into each output spectral channel.