Pulse profile variability during the first four 10-second-long segments (a, b, c, and d) of the single-peaked interval. Profiles observed within the time ranges indicated in the legends are plotted in black. Time is counted from the onset of the single peak. Pulsed fractions and detection significance levels are shown in each panel. Blue and orange filled step plots show the averaged pulse profile of the full single-peaked interval and the averaged over both nights typical double-peaked pulse profile, respectively.