Fig. 4.
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Chandra/HETG spectrum of EXO 2030+375. Panel (a) shows the count spectrum of MEG (red) and HEG (magenta) with the best-fit model (black). The inset shows a close-up of the iron band. Panel (b) shows C residuals for the best-fit model with Si XIV Lyα, Fe Kα, Fe XXV Heα, and Fe XXVI Lyα lines. Panel (c) shows C residuals for the same best-fit continuum model without any emission lines.
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