X-ray spectra of HD 149404. Top panel: combined RGS (RGS1 + RGS2, first and second orders, all three observations) spectrum of HD 149404. The labels indicate the lines that are apparent in this spectrum. The error bar in the top left corner indicates the mean error on the energy bins in the combined RGS spectrum between 10 Å and 20 Å. Bottom panel: comparison of the EPIC-pn spectra of HD 149404 during the three observations. The first observation (φ = 0.227) is shown in blue, the second (φ = 0.992) in red, and the third (φ = 0.487) in green.