Count rate in the 0.3–10.0 keV band vs the vignetting-corrected exposure time for all the sources detected in the data set considered. FSRQs: blue points; BL Lacs: green points; other targets and serendipitous sources: light grey points. The dotted horizontal line marks the count-rate limit above which pileup problems become significant in data taken in PC mode. The red histogram represents the number of blazars in each time bin, showing three peaks at approximately 1, 2, and 4–5 ks, the preferred exposure times for blazars.
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