M 87 long-term light curves with their Bayesian blocks derived according to Sect. 2.2 for 1-day- (top), 7-day- (middle), and 15-day-binned flux points (bottom). The H.E.S.S. data points are shown in black, and a constant fit is shown with the solid orange line. The blocks with their flux levels are given by the blue rectangles. Dashed orange lines indicate a change in the flux level. The orange numbers at the bottom indicate the labels of the blocks.