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Fig. 2

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[Ca/Fe] and [Si/Fe] vs. [Fe/H], from left to right. The density plot is the distribution of simulated long-living stars for our model; the density is on a logarithmic scale, normalized to the peak of the distribution and the bar over the plot describes the assumed color scale. Superimposed on the density plot, we show the abundances ratios for halo stars (data from Frebel 2010).

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