Upper panel: lightcurves of all five observations as a function of orbital phase. Lower panel: variation of the hardness ratio. Except for the somewhat softer hard-intermediate state observation ObsId 3815, all observations were in the low/hard state. Dips are strongest at φ_orb ~ 0.0, still present at φ_orb ~ 0.2, and φ_orb ~ 0.75, and they vanish at φ_orb ~ 0.5. Colors indicate the parts of the observations used in the analysis (see Fig. 1), while data in black were excluded from the analysis.