; CHANSEL
;---------------------------------------------------------------
;! Array of start, stop, increment channel numbers to average
;# ADVERB CALIBRATION SPECTRAL
;-----------------------------------------------------------------------
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;;
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;-----------------------------------------------------------------------
;---------------------------------------------------------------
CHANSEL   LLLLLLLLLLLLUUUUUUUUUUUU CCCCCCCCCCCCCCCCCCCCCCCCCCCCC
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CHANSEL
Type: Adverb  (REAL, 3 elements x 10 rows)
Use:  Standard data selection adverb, used to specify a list of
      start and stop channel numbers plus an increment to be
      averaged to form a pseudo-continuum channel.
      Up to 10 sets of channel numbers can be specified. The
      first two elements specify the start and stop channel
      numbers, the third specifies the increment within that
      range, i.e.if CHANSEL = 10,20,2 that means take every
      other channel in the range 10 - 20, so that channels
      10,12,14,16,18,20 would be averaged together.
Null Value:  0
      A null value means use all channels. A null value for the
      third element means that the increment is set to 1.
      Note that the code assumes CHANSEL(1,n) < CHANSEL(2,n) and
      CHANSEL(3,n) <= 0 means use 1.

      See ICHANSEL for IF-dependent channel selection.

Tasks:
   ATLOD.....Reads ATCA data in RPFITS format into AIPS.  CHANSEL
             selects which spectral channels are loaded.  0 -> all
   BSCAN.....Seeks best scan to use for phase cal, fringe search, ...
             CHANSEL is an output adverb giving start/stop times and
             number of antennas in each group found.
   OTFUV.....Translates on-the-fly single-dish SDD format to AIPS UV
             file.  CHANSEL specifies channels to be flagged on input.
   SDLSF.....Least squares fit to channels and subtracts from SD uv
             data.  CHANSEL selects channels to be fit.
   SERCH.....Finds line signals in transposed data cube.  CHANSEL sets
             line search regions.
   UJOIN.....Modifies UV data converting IFs to spectral channels.
             CHANSEL selects channels to use for up to 10 IFs.
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