MAP_CONTINUUM GAUSS

        [ADVANCED\]MAP_CONTINUUM  [DIRTY|CLEAN|Other]  /METHOD  GAUSS [Threshold
    [Nhist]]

      Compute the continuum based on the per-pixel spectrum.  Each  spectrum  is
    sigma-clipped and the histogram of the intensity distribution is fitted by a
    Gaussian.   Corrective  techniques  are  applied  to ensure the fit has con-
    verged.  The position of this Gaussian gives the continuum level.   A  noise
    estimate is also derived.

      The  method does not deliver a spatially independent noise, but adapts the
    bandwidth to the line free zones for each pixel. It may fail for pixels with
    are close to line confusion.

      The optional arguments control the algorithm. Threshold is clipping  level
    value  for  the  Gaussian: valuesi n range 2.5 - 4 are usable (default 3.5).
    Nhist is the number of histogram bins. The default is to adjust this  number
    depending on the number of channels in the data.