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Fit a source with a small number of net counts

**If the number of net counts for a source is less than **** it is
impractical to fit the data in all 34 energy bits. However, if the
flux is required, then a fit must be performed first. This
can be done by setting the hidden parameter ***rebin=yes*, which bins
the data into a single bin before fitting for the normalization only.
The user must specify all the parameters in the
chosen model except the normalization.
*Fit* will then calculate the normalization of the model and
xflux can
be used to determine the flux and luminosity of the source from
the best fit model.

xs> fit rebin=yes

*rsdc@cfa.harvard.edu *

1998-06-10