Pulse profiles of the combined obs1 and obs2 extracted during the different count-rate intervals of the blue states as in Table 3. In all panels of this figure, count rates were normalised to the maximum. Pulses are repeated twice for clarity and the red solid lines represent the best fits to the profiles with two sinusoidal functions as described in the text. The insets in each panel show the lightcurves of the two observations in the 0.5–11 keV energy range (as in Fig. 1) with the time intervals used to extract the pulse profiles highlighted in red.