; DOCALIB
;---------------------------------------------------------------
;! specifies whether a gain table is to be applied or not
;# ADVERB CALIBRATION
;-----------------------------------------------------------------------
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;-----------------------------------------------------------------------
DOCALIB   LLLLLLLLLLLLUUUUUUUUUUUU CCCCCCCCCCCCCCCCCCCCCCCCCCCCC
----------------------------------------------------------------
DOCALIB
Type: Adverb  (Logical,  > 0  =>  true)
Use:  Standard data selection adverb. True (> 0) means apply the
      selected gain table before the specified operation on the
      uv data.  False (<= 0) means do not apply calibration.

      A special value, DOCALIB = 2 (actually >= 1.5) is used to tell
      AIPS tasks to apply the amplitude calibration to the data
      weights as well as applying the amplitude and phase calibration
      to the visibilities.  DOCAL=2 should be used with all VLBI data
      and with any VLA data loaded by FILLM with weights set by the
      nominal sensitivities.  The option to do this was added to the
      31DEC00 (then called 31DEC99) version of FILLM on March 25,
      2000.

Null value:  false (-1)
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