Spectral evolution seen during the large flare. The 3–10 keV spectra taken from (i) 68–72 ks; (ii) 72–80 ks; and (iii) 80–88 ks in Fig. 4 are shown. The histogram indicates the best-fit photoionized absorption model (see text). The Fe K emission lines are modelled by a Gaussian. The dotted line indicates the observed energy of 6.5 keV where the mean Fe K line peaks.
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