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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