Fig. 3.
Left panel: folding search for periodicity in the 5–12 keV XMM-Newton/Epn light curve. The horizontal dashed line indicates the χ2 value of 21.85 at which we have the 99.73% confidence level for a single trial, corresponding to a significance of 3σ. Right panel: XMM-Newton/Epn folded light curves obtained by adopting the best period and using 16 phase bins per period.
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