Light curves of 1E 1613 from the 2016 observation (A) in the 1–12 keV range (top) and in a hard band (5–12 keV) (bottom). The time bin is 250 s. The background contribution is negligible and was not subtracted, but the background level in the proper energy band is shown in red in each panel. The arrows indicate the faint flares (more prominent in the hard band) that are discussed in Sect. 3.