Fig. 2
EPIC pn light curves and hardness ratios (HR) for all the observations of our sample with a binning of 64 s. Time is shown in hours since the beginning of the observation. The hardness ratio is obtained dividing the bins in the 3 − 10 keV energy range by those in the 0.7–3 keV energy range, except for 4U 1705 − 44, 4U 1728 − 34, and GX 340 + 0, for which the soft band is 1.5–3 keV, 1.8–3 keV, and 2.2–3 keV, respectively.
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