Fig. 5
Portion of the HR11 GIRAFFE spectrum for star 2023 in the region of the Na doublet at 5682.65 and 5688.22 Å (solid black line). The spectra of star 1077 (dashed red line) and of star 2124 (dotted blue line), with the most similar atmospheric parameters in our sample, are superimposed. Sodium abundances for the three stars are labelled.
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