MAP_CONTINUUM SCM

        [ADVANCED\]MAP_CONTINUUM   [DIRTY|CLEAN|Other]  /METHOD  SCM  [Threshold
    [MaxIter]]

      Compute the continuum based on the per-pixel spectrum.  Each  spectrum  is
    sigma-clipped  until  convergence of the noise. The method is similar to the
    GAUSS method, but more robust at the expense of lower speed because  of  the
    iterative  median  clipping. Threshold is the number of sigma used for clip-
    ping. MaxIter is the maximum number of clipping  operations  performed  (de-
    fault 6).

      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, though less than the GAUSS method.