Fig. 4
Top: observed NARVAL spectrum (black) of the H-α profile of HD 140283 and fitted spectrum (red) using the three narrow continuum masks (shaded regions) for log g = 3.65 and [Fe/H] = –2.46. Bottom: residuals between the observed and fitted spectrum for each line mask, with the black dots indicating the line masks. See Sect. 5 for details.
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