Residuals of the flux-resolved spectra of N1 (FPMA in gray, FPMB in varying color). The blue dashed lines in panels (a) and (b) mark the positions of the CRSFs, using the values listed in Table B.1. The χ² residuals (a) and ratio (b), when only evaluating and re-normalizing the flux-averaged best-fit parameters, are shown. Refitting the parameters of the four flux-resolved spectra simultaneously, lead to the best fit as given in panel (c). Panel (d) highlights the contribution of the “10 keV feature”, by showing the resulting ratio after removing the component from the best-fit that is shown in the lower left panel.