Fig. 8
Line-to-line relative iron abundance of 18 Sco as a function of excitation potential (top panel), reduced EW (middle panel), and wavelength (bottom panel). Crosses (circles) are Fe i (Fe ii) lines. The solid lines in the top and middle panels are linear fits to the Fe i data. In the bottom panel, the solid line is a constant which corresponds to the average iron abundance of this star.
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