Fig. 1

Data-to-model ratio expressed in terms of standard deviations with respect to a power-lawabsorbed by Galactic column density (1.02 × 1021 cm−2, Kalberla et al. 2005). A deep and narrow drop of counts at E ≈ 2.5 keV (observed frame) is clearly present. Black data points indicate EPIC-pn, while green and red data points represent EPIC-MOS1 and MOS2, respectively.
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