From top to bottom: [Fe/H] distribution (hatched black) of stars in sample. The grey histogram shows the [Fe/H] distribution of giant stars, the red histogram that of turnoff stars; [Mg/Fe] − [Fe/H] and [Ca/Fe] − [Fe/H] distributions of stars in the sample (grey dots for giants, red dots for turnoff stars); [Ba/Fe] − [Fe/H] distribution of stars in the sample (grey dots for giants, red dots for turnoff stars). Stars have only an upper limit estimate of the [Ba/Fe] ratio are indicated by an arrow.
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