Fig. 2.
Comparison of the data (black) and power law model (red). An excess of photons is observed between 6.4 and 7 keV suggesting the presence of emission features ascribable to neutral and/or possibly ionized iron. Also a bump of unmodelled photons is found above ∼10 keV. For plotting purposes the FPMA and FPMB spectra of all the epochs and their residuals in terms of errors with respect to the model are displayed grouped (setplot group in Xspec).
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