Best fit parameters for cubic fits to the evolution of the count rate of normalized pulse profiles for the used 128 pulse phase bins (red points). The reference 35 d phase is C = 0.1. Upper left: A (constant), upper right: B (linear), lower left: D (quadratic), lower right: E (cubic). For comparison, also the pulse profile for 35 d phase 0.122 is shown. For the parameter A, which is basically the profile itself, the “sharp edge” at pulse phase 1.0 is drawn.