Fig. 6.
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Left: Lomb–Scargle periodogram of the 2014−2015 Swift-XRT light curve of NGC 5204 X–1 in solid black. The 2σ and 3σ mark the false alarm probability levels computed from bootstrapped samples (see text for details). The inset plot shows the structure of the observing window. Right: Swift-XRT light curve with the best-fit period from the periodogram (orange solid line).
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