Fig. 3
Left panel: modified Fourier (with its spectral window on top), AOV, and conditional entropy periodograms considering all Swift data. Middle panel: modified Fourier periodograms for different sets of Swift data. Right, top panel: zoom on the low-frequency content of the modified Fourier periodogram calculated on all Swift data. Right, bottom panel: modified Fourier periodogram, with its spectral window, for Swift and XMM-Newton-pn data combined. The pn data were arbitrarily scaled by a factor 0.1. The two known periods (see also Sect. 4) are shown by dotted lines: green for 2366 d and red for 6.6 d.
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