Spectrum observed by the EPIC-pn between 2.4 and 10 keV together with the best-fitting blackbody (red dashed line) and Comptonization (blue dashed line) component of Model II listed in Table 1 (top panel). Residuals obtained when the six emission features at energies E₁ = 6.75 keV (green solid line), E₂ = 6.48 keV (red solid line), E₃ = 7.12 keV (blue solid line), E₄ = 2.74 keV (cyan), E₅ = 3.30 keV (magenta), and E₆ = 3.94 keV(yellow) are removed from Model II (middle panel). The model is not fitted after the line removal, so the residuals are only plotted for illustrative purposes. Residuals left by Model II are plotted in the bottom panel.