CHECK

 

        CLIC\CHECK  Threshold  The  continuum  correlator   had   occasional
    instabilities   in   some   of  the    30    subbands.     This  command
    attempts  to  find  out   possible  misfunctions  of  some  subbands  by
    comparing  the  amplitude of a subband to the  mean  amplitude of the 10
    subbands of the same baseline.  Threshold  is  the  detection  threshold
    (expressed  in  standard  deviations   from   mean value).  This command
    process only the current record.

    An example of use is
    VARIABLE DESCRIPTOR ON  ! Turn on Descriptor variables.
    SET TYPE PHASE          ! Use only on continuum sources,
                            !   otherwise no signal...
    FIND
    FOR I 1 TO FOUND
      GET NEXT
      FOR J 1 TO R_NDUMPS   ! Process record by record
        GET/RECORD J
        CHECK 2.0           ! 2 sigma is severe limit. 3.0 is a normal value.
      NEXT
    NEXT
    While these instabilities tend to smear  out   with   time,   a   strong
    misfunction   may   influence   the  result.   Data  should  be  flagged
    accordingly, specially before bandpass calibration.  Checking the source
    data itself is more difficult, since the signal may be too weak.