Examples of spectral synthesis applied to single lines for star WFI 512115. Big dots are the observed spectrum, solid lines represent the best fitting synthetic spectra, computed with all parameters fixed to the values of Tables 3 and 4, except for the abundance of the element under consideration. Spectra computed with the line abundances altered by ± 0.1 dex – with respect to the best fitting spectrum – are shown as dotted lines.
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