Normalized flux-resolved pulse profiles, obtained as explained in Sect. 4.2. Each column corresponds to a different flux range, given by the count rate C (counts/s) in the 8–10 keV band averaged over the pulse cycle. The number followed by “pc” in the top row is the number of pulse cycles per observation and flux level. Obs 2 covers the whole flux range, while Obs 1 and Obs 3 only have data within 3 and 4 flux intervals, respectively. The distributions of the 8–10 keV mean count rate per pulse cycle and the flux limits are shown in Fig. 6.