Fig. B.1.
Bi-dimensional histograms of simulated ℛ0 and ℛ1, assuming a featureless power-law spectrum with the observed source brightness and spectral slope for Xp8 (Left) and Xp15 (Right). The vertical and horizontal dotted lines indicate the adopted thresholds for Fe XXV-excess source selection, ℛ0 > 0.08 and ℛ1 > 0.5. The cross in each panel indicates the observed point.
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