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A frequently used procedure, alternative to the correction for the chromatic
response, is to normalise the continuum to unity by dividing the observed
spectrum by a smooth approximation of its continuum. This approximation can
be obtained either interactively with the graphic cursor, or from a table
(command NORMALIZE/SPECTRUM) or by dividing the raw data by itself after
filtering or smoothing. Median filtering and running average algorithms are
well
suited for this purpose (command FILTER). A spline fit can be made to the
points defined interactively as well as to the filtered data (command CONVERT/TABLE). The MIDAS Fitting Package permits to go further and perform
a more advanced modelling of the continuum.
Petra Nass
1999-06-15