GAUSS

 

        ANALYSE\GAUSS

    GAUSS performs a fit of a theoretical profile in the  R  spectrum  using
    initial values specified by the command LINES. The profile is determined
    by  the  METHOD  command  (GAUSS,  SHELL  or  NH3  lines  are  currently
    implemented,  and a special method, CONTINUUM, may be used for continuum
    data).

    If LINES is 0, an attempt to guess initial values for a single  line  is
    done  by computing the moments of the spectrum.  A first minimisation is
    performed using the Simplex technique; the results are improved and  the
    uncertainties  computed  using  the  Gradient  technique. GAUSS uses the
    masks defined by SET MASK. If GAUSS did not converge, the errors  quoted
    in  the  results  are meaningless, and you should use command ITERATE to
    try to do better.

    For CONTINUUM method, although a linear  baseline  is  fitted  with  the
    gaussian,   only   the   gaussian  parameters  are  displayed.   If  the
    observation was made using beam-switching method and the reference  beam
    appears  in  the  drifts,  a  two-component  gauss  fit  is  done  using
    separation specified in the data.