XRT spin-phase-folded light curve in the energy range 0.5−10 keV. Two cycles are shown for clarity. The errors quoted are the square root of number of counts in the source region plus the area-scaled number of counts in the background region, divided by the exposure. The continuous black line shows the best fit with a cosine A(φ_spin) function. The dashed line represents the mean value A₀ = 0.260 counts s^-1 obtained from the fit.