Fig. 1.
Best-fit unfolded spectrum (top panel) and residuals for the two-component hydrogen atmosphere (middle panel) and carbon models (bottom panel). Only the EPIC PN spectrum from observation 0742050101 is shown for clarity. The contribution of the cold and hot components to the two-component fit is shown with thin lines. The total model flux is indistinguishable for the two models and is shown with the thick red line.
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