STATISTIC

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

    Compute  some  basic  statistics  (min, max, mean, rms,...) on the specified
    DataCube buffer (default: CLEAN) and planes (default:  variables  FIRST  and
    LAST).   The current polygon or mask (see commands SUPPORT and MASK) is used
    to define the area on which the pixels are to be taken into account,  except
    when /EDGE 0 is mentionned.

    In addition to Min and Max, the command prints 3 noise numbers:
    - the rms inside the current support (whose value depends on the source
    strength and structure)
    - the rms outside of the support (a good estimate of the effective
    noise), returned in variable STAT_NOISE.
    - the theoretical thermal noise (that would be the expected noise unless
    the data is dynamic range limited, or unless the weights were
    not set properly)

    For  primary-beam corrected images (SKY), the noise is non uniform.  In this
    case, the rms outside the support is actually derived through a Gaussian fit
    to the intensity histogram, whose shape is non-Gaussian as larger noise hap-
    pens at mosaic edges. This is a better approximation on the  rms  noise  to-
    wards the mosaic center.