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    [/ANTENNA a1 ...] /FRACTION fraction

    Store in the header of each scan (of the current index) the  information
    whether  the  atmospheric phase correction is or not declared valid, and
    should be actually applied when SET PHASE ATM is selected.  This  is  an
    antenna-based flag.

      - GOOD: the atmospheric phase correction is to be used.

      - BAD: the atmospheric phase correction is not to be used.

      - AUTO [tmin]: that information is determined on the phase calibrators
        (type PHASE), by comparing the  scan-averaged  amplitudes  with  and
        without  the  correction. This information is then propagated to the
        neighbouring source observations (type OBJECT), in a +- tmin minutes
        time window.  `tmin' defaults to 15 minutes.

      -  SELF:  that  information  is determined on the source, whatever its
        type may be, by comparing its amplitude with and without the correc-
        tion. This will produce random result if the source has no continuum

      - STORE CORRECTION /RECEIVER irec: the  validity   of  the  correction
        from  Receiver 'irec' is used (useful to transfer the correction va-
        lidity from one frequency to the other).

    With option /ANTENNA a1 a2 ..., only the specified antennas are  consid-
    ered. The correction validity for other antennas is not modified.

    With  option  /FRACTION fraction, fraction of amplitude will replace the
    noise in estimating if uncorrected is better than corrected.

Gildas manager 2018-11-19