Top panel: X-ray spectrum of IGR J17511–3057 observed by the EPIC-pn (blue points), RGS1 (red points), RGS2 (green points), JEM-X (magenta points), and ISGRI (cyan points) during the 2015 outburst. RGS1 and RGS2 spectra were rebinned for graphical purposes. The best-fit model (black line), the Fe line (green line), the disk (red line), single-temperature black body (magenta line), and the Comptonized (blue line) spectra are also shown. Bottom panel: residuals with respect to the best-fit model.