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Read spectrum into XSPEC OR calculate a hardness ratio

At this point you have a response matrix and a PHA file. It is therefore possible to read the spectrum directly into XSPEC and fit as usual. Since the spectral resolution is low parameters are often not well constrained within XSPEC, it is often more useful to create simulated spectra to determine whether a given model is consistent with the hardness ratio. Here we describe both these options.
Mon May 11 15:21:25 EDT 1998