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Fig. 3


Abundance ratios as a function of stellar (ASTEC) age. For stars younger than 6 Gyr (black filled circles) the lines show linear fits to the data. The Sun, shown with the symbol, was not included in the fits. Red filled circles show five old stars with low [Na/Fe] relative to three stars with similar age shown with green filled circles. Three [α/Fe]-enhanced stars are shown with open blue circles.

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