Results from the local timing analysis described in Sect. 3.2. The top and bottom plots refer to the first and second XMM-Newton observations, respectively. Fermi-LAT counts were calculated using photon weights. Both Fermi-LAT and XMM-Newton counts were normalised to 1. Counts from the diffuse γ-ray background are not shown. Statistical error bars are included for both phaseograms. The dotted vertical lines indicate the best-fit locations of the X-ray peaks and higher γ-ray peaks. An initial phase ϕ₀ = −0.19 was introduced in the first observation mostly for display purposes in order to align the γ-ray phaseogram with that of the second observation.