Images and spectra retrieved by the GMCA with inpainting step in the real data from Cassiopeia A between 5 and 8 keV. The first source corresponds to a synchrotron emission, while the two following sources are parts of the Fe distribution; the first of these latter two is a redshifted part of this distribution, while the second is a blueshifted part of the distribution. The error bars in both parts of the Fe distribution are retrieved thanks to a block bootstrap with blocks of size 78. A fitting in Xspec gives the line energies of 6.726 ± 0.002 keV for the blueshifted part and 6.561 ± 0.001 keV for the redshifted part. The last image is the one we identify as noise.
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