Iron abundance of the XO-2 stellar binary derived through the analysis based on equivalent widths as a function of the excitation potential and reduced equivalent widths. Empty and filled circles represent the Fe i and Fe ii lines, respectively. Solid lines show the location of mean log n(Fe i), while dashed lines represent the standard deviation ±1σ. The dotted line is intended to guide the eye to the solar iron abundance at log n(Fe i)⊙ = 7.53.
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