Left: spectra retrieved by GMCA for different Fe line-to-synchrotron ratios in our first toy model with a total number of counts corresponding to a 1 Ms observation. Retrieved spectra are shown as solid lines, theoretical spectra as dotted lines. The synchrotron spectrum is displayed as an indication of the relative strengths. The two other plots represent parameters of the Fe K component retrieved by GMCA for 100 realizations of each of nine different Fe line-to-synchrotron ratios with a total number of counts corresponding to a 1 Ms observation. Center: retrieved Ec and norm. Right: retrieved Ec and σ. In both cases, the theoretical results are represented by crosses.
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