Left panel: [Mg/Fe] distribution for the stars with very high probabilities (>85%) to belong to population A (empty histogram) and B (shaded histogram). The two lines show the peaks of these two distributions: 0.05 and 0.25 respectively. The hatched histogram represents the stars with low probabilities to belong to one or the other population. Right panels: [Mg/Fe] as a function of [Fe/H] and [Mg/Fe] for the three groups of stars.
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