Comparison between the disc wind and disc line scenarios. Top panel: pcygx (magenta) and diskline (cyan) best-fit models, superimposed for reference to the combined EPIC spectrum (rebinned for clarity). It is important to note that the effects of the warm absorber on the Fe-K band are negligible in either case. Middle panel: fit residuals with respect to the pcygx model, computed as (data–model)/error for the individual EPIC spectra (colour-coded as in Fig. 1). Bottom panel: same as above but for the diskline model.