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    Compute  the receiver gain ratio (Image Side Band over Signal Side Band)
    from correlation data on a continuum source. Compute also  the  LO1  and
    LO3  phases that should be used in real time to have zero phases in both
    side bands (DSB receiver up to 2006), or the relative phases  between  H
    and V polar (SSB dual-polarisatoin receivers)

    The  data from all the scans in the current index are averaged except if
    optional argument SCAN is given, in which case the gain ratios are  com-
    puted for each scan.

    Option  /PRINT  produces a procedure INTER_OBS:gain.obs to set the gains
    (and phases) in OBS.

    Option /OFFSET allow to only compute the phases, not the gain ratio.

Gildas manager 2018-02-24