Line-to-line abundance scatter of the reference stars determined directly from the absolute values obtained from all methods, indicated with black error bars (std). Red diamonds represent the difference of these abundances with respect to the final abundances obtained by performing a differential analysis with respect to the Sun (dif), with the error bar representing the line-to-line scatter. At the top of each panel we report the number of lines used for the determination of the abundances with both approaches.
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