[Ifeffit] Least Squares Fitting in Athena
stousta at iit.edu
Tue May 24 15:41:15 CDT 2005
I have a couple of comments about LSF in Athena and I would like to hear
other people's opinions on the matter.
Also, it would be interesting to know: are there
many people who use Athena to do LSF?
I found that there is some inconsistency with plotting after
the fit is done. In my case nonzero energy shifts are applied to
the fitted data and the standards. The resulting linear combination fit
doesn't look shifted in energy appropriately - visually there is a
mismatch between the data and the fit. On the other hand, R-factor and
Chi^2 are very reasonable. This looks somewhat confusing.
Also, in my experience the obtained fractions in Athena come out slightly
different from those I could get using Sixpack LSF software. In my fits I
used the same constrains/options, same data and references and same data
range. What can be the cause of this?
Research Assistant/PhD student
Illinois Institute of Technology
email: stousta at iit.edu
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