Fig. 2.
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X-ray spectrum by stacking three observations in 2010 (black) and five observations in 2015 (blue). The dotted line shows the best-fitted model consisting of a power law and a blackbody component. We note that the spectral fittings were performed jointly to the 2010 and 2015 data based on this model. The corresponding data-to-model ratios are shown in the bottom panel.
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