X-ray lightcurve of the full EPIC (MOS1 + MOS2 + pn) count rate folded in phase with the ν₁ frequency. The data were binned into phase intervals of 0.1 and phase 0.0 was arbitrarily taken as the starting time of observation I (HJD 2 456 456.1871). The bottom and top panels show the results for the background-corrected count rates and after removing the long-term trend from the background-corrected count rates, respectively (see text).