XMM-Newton 0.2–2.0 keV light curves of the four epochs, scaled by the arrival time of the first eruption in each observation. Time intervals contaminated by the flaring background are shown in grey. In the top panel, we additionally show the rise, peak, and decay phases selected for August 2020, as an example. In the second panel from the top, the first eruption is only partially resolved in EPIC-pn data and renormalized MOS1 data are shown with empty symbols. As the x-axis range is shared, we note the shortening of recurrence times over the ∼3.3 yr baseline, with vertical dashed lines showing the average arrival time interval of the previous epoch to guide the eye.