MEAN

        [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%SUM and POLY%AREA.

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