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Fig. 1

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Light curves of NGC 5408 X1/ObsID 302900101 (top panel) and POX 52 (bottom panel). Stars indicate the background light curves and filled dots indicate the background-subtracted light curves, plotted only for the observation period for which the background activity is “low” (see text for details). The brackets on top of the light curves indicate the segments that were used to estimate the excess variance in each case.

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