Fig. 4.
From top to bottom: line iron abundance retrieved by STEPAR for the final solution of the four reference stars: the Sun (NARVAL), HD 22879 (NARVAL), ξ Hya (ESPaDOns), and Arcturus (UVES). log ϵ(Fe I) stands for the Fe abundance returned by the Fe lines, while log (EW/λ) is their reduced EWs. Unfilled black dots represent Fe I lines, whereas red dots are Fe II lines. The dashed black lines represent the least-squares fit to the data points.
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