Fig. 4.
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Timing analysis of NGC 4631 ULX X-6 from the C2 observation. (a) Background-subtracted light curve in the 0.3–10 keV band with a bin size of 500 s. (b) Lomb–Scargle periodogram showing a peak at P = 5120 s (∼1.42 h) at the 2.6σ confidence level. (c) Folded light curve at P = 5120 over two cycles, normalized to the mean count rate.
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