> I just realized that the effects of even moderate pile-up
> fractions could have rather serious consequences for spectral fitting.
You are absolutely right, particularly since, as you say, the rapidly dropping
effective area at high energies gives the piled up events even more leverage.
There is a spectral fitting tool that can handle pile-up - the Interactive Spectral
Interpretation System (ISIS) developed by the CXC group at MIT. Have a look at
I haven't actually given this a try, so I can't speak to how easy it is to
install or use, but it is certainly worth checking out.
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