Contours of constant pulsed fraction assuming the best-fit parameters of the pn double-blackbody model ( eV, km, kT_sp = 117.0(8) eV, km). Count rates are computed in the 0.5–1.35 keV energy band to exclude the effects of the Gaussian absorption line and pulsed fraction labels are given in percent. Darker colours denote higher pulsed fractions. The allowed parameter space of the viewing geometry constrained by the timing analysis lies below the thick pink line (p_f ≤ 2.78(16)%; Table 4).