Fig. 3
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Fourier transform of the EPIC-pn light curves in total band, shown with log-log scaling. The 10 and 100 s binning are used on top and bottom, respectively, and the first and second XMM-Newton observations are represented by the solid black and dotted red lines, respectively. The blue line provides A ∝ f−−0.75 while the green line shows A ∝ f−0.5.
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