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        [GREG2\]MEAN [/CLIP Nsigma]

    computes crude statistics on the part of the Regular  Grid  array  lying
    inside  the  current polygon. Blanking values as defined in SET BLANKING
    are ignored. The results are displayed (some of them  according  to  the
    current ANGLE_UNIT), and stored in the variables:
    - POLY%NPIX (number of non-blanked pixels in the polygon),
    - POLY%MIN
    - POLY%MAX
    - POLY%AREA (area of the non-blanked pixels),
    - POLY%SUM (integrated intensity),
    - POLY%RMS.

    If  option  /CLIP is present, iterative kappa sigma rejection is used to
    reject outlier pixels.

Gildas manager 2020-12-02