Diagnostic plots for three typical stars in our sample. Top row: ET0057, [Fe/H] = −1.3, GIRAFFE. Middle row: ET0048, [Fe/H] = −1.9, GIRAFFE. Bottom row: UET0049, [Fe/H] = −2.2, UVES. For each star, iron abundances (Fe I: black; Fe II: red) are plotted against wavelength, excitation potential and EW of the line. Dotted lines are the mean [Fe/H] of each star while solid lines show the slopes of best fits.
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