Fig. 1
Folding search for periodicities in the 2–5.4 keV EPIC-pn light curve. We adopt 8 phase bins per period for the trial-folded light curves and a resolution of period search of 1 × 10-6 s. The peak of χ2 is detected at 0.592884 s. The horizontal dashed line indicate the χ2 value of 18.47 at which we have the 99% confidence level for a single trial.
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