a) Phase-averaged spectrum of Obs. II with best-fit model: XIS0 (blue), XIS1 (red), XIS3 (magenta), PIN (green) and GSO (brown). b) Residuals of continuum model without CRSF and Fe lines. c) Residuals of continuum model with narrow Kα and Kβ lines of neutral iron only and CRSF. d) Residuals of continuum model with both neutral and He-like Fe lines but without CRSF. e) Residuals of best-fit model including CRSF and Fe-lines.