Light curves of the: observed flux in the 4–5 keV energy band (upper panel); intensity of the Fe Kα line (medium panel); observed flux in the 0.5–1.5 keV energy band (lower panel). The numbers in each panel indicate the chi-squared value for a fit against a constant versus the number of degrees of freedom. Filled circles: XMM-Newton/EPIC; empty circles: Swift/XRT; filled star: Suzaku. The scale on the y-axis in all panels corresponds to ± 50% of the mean level (dotted lines).
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