[α/Fe]–[Fe/H] distribution at the solar vicinity for our sample. The colors (indicated in the legend) and size (larger implies older) of the symbols indicate the age of the stars. The stars below and to the left of the line are either accreted stars according to Nissen & Schuster (2010; for those objects that have [Fe/H] <−0.7 dex), or metal-poor thin disk stars. They are represented by empty circles in Fig. 2, and removed from the age-alpha distribution in Fig. 3.
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