Upper panel: [Na/Fe] ratios as a function of metallicity for stars in the final homogenised sample (grey triangles for dwarfs and blue triangles for giants). Larger filled circles represent stars recognised as outliers with respect to the bulk of the distribution (with no distinction between dwarfs and the few giants). Dotted line have the same meaning as in previous figures. Bottom panel: the same, but for the ratios [Na/H].
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