XMM-Newton light curves (background subtracted) in the 0.3–2 keV and 2–10 keV energy bands are shown in the top and top-middle panels, respectively. Bottom-middle panels: NuSTAR background subtracted light curves in the 10–79 keV band are reported, while the bottom row reports on the ratios between light curves in the 0.3–2 keV and 2–10 keV band. The adopted time binning is 1 ks for all the observations, and the solid violet lines account for the average rate of each observation, while dashed lines account for the standard error of the mean.