Top and middle panels: coadded FPMA and FPMB light curves shown in the 3–10 keV and 10–79 keV energy bands, respectively. For the various pointings, the ratios between the 10–79 keV light curves and those computed in the 3–10 keV band are shown. The adopted time binning is 4 ks for all the observations. Solid green lines account for the average count rates within each pointing. The exposures in the graph are twice as long as those reported in Table 1 because half of the NuSTAR time is cut due to Earth occultations.