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Fig. 7.
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Top: Lomb-Scargle periodogram of NICER data, a peak is visible at a period of 79 ks. Bottom: NICER light curve (300 s bin) folded for a period of 78 ks (left) and 79 ks (right). With red arrows, we mark the duration of the XMM-Newton observation. The shaded region in phase outlines the low-flux states as shown in Fig. 5.
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