STATISTIC /NOISE

        [DISPLAY\]STATISTIC [DataCube [FirstPlane [LastPlane]]
      [/EDGE Margin] /NOISE VarNoise [ONLY]

    Return  the  rms  noise  in the specified VarNoise SIC real scalar variable.
    The rms noise is also available in variable STAT_NOISE, and if the image  is
    the  CLEAN (resp. SKY) image, in CLEAN%NOISE (SKY%NOISE) as well for further
    convenience and use in scripts.

    Keyword ONLY is reserved for specific internal use: it  instructs  STATISTIC
    command to only use the simple rms derivation on SKY images, rather than the
    more elaborate fitting of the intensity distribution.