Phase-resolved continuum parameters of the fit model. The blue dashed line gives the phase-averaged values at the 90% confidence level (shaded). The FPM A and FPM B cross-calibration constant 0.965 and the column density 6.35 × 10²² cm⁻² are fixed to the phase-averaged best-fit values. The “iron scaling constant” shows the variation in the relative strength of the iron line complex, whose parameters have been otherwise fixed to the phase-averaged values. No significant changes can be identified in the continuum parameters. Lowest panel: we plot the (re-scaled) pulse profile. Errors are at the 90% confidence level.