Fig. 2.

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Two XMM-Newton/pn, Chandra stacked, and NuSTAR folded spectra in 2–10 keV with a simple power-law model, and the ratio of the data and model. Upper panel: model was fitted for the 2–5 and 8–10 keV band spectra and extrapolated to 2–10 keV. Middle panel: ratio of the data and model with the simple power-law model, and obvious excess in the 5–8 keV band of the two XMM-Newton/pn and Chandra observations. Bottom panel: ratio of the data and model with the simple power-law plus a Gaussion line model, which might be a relativistic broadening Fe K emission.
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