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Constraining the fit
The progress of obtaining best fits can be manipulated by applying restricting
conditions to the procedure. This is done by indicating parameters for the
linear condition
 |
(2) |
with a weight factor
for each line and a right hand side
. When all
weight factors are zero, no restricting conditions will be applied. Only lines
with weight factors
will have to meet the restrictions during the
iteration, all lines with
are free, will have to adapt, though, to the
restrictions of the other lines. For example, with Eq. 2 an expected
count number for a line can be set fixed, by setting the corresponding weight
factor
and setting
to the
expected line counts. All other lines will then have to adapt to the one line
having the desired line counts. Also line ratios can be fixed, by setting, e.g.,
,
, and
. The ratio of
will then be 0.5 at the
end of the fit, and the rest will end up with the best fit under this
restriction.
Next: Beta profiles
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Jan-Uwe Ness
2003-05-23