Top: background-subtracted, vignetting-corrected X-ray (0.5−10 keV) light curve of XMM-Newton EPIC PN+MOS1, binned to 77 s. Dashed orange lines mark intervals where the 511 s pulsations are visible by eye, and the histogram shows the distribution of rates. Bottom: PSD amplitude [Rate2 Hz−1]. Dashed lines show the confidence contours of simulated light curves without periodicity, assuming white noise variability. The orange dashed lines indicate the 511 ± 10 s period.
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