Age-[α/Fe] distribution at the solar vicinity after removing metal-poor thin disk stars and accreted stars, as selected from Fig. 1. We note the remarkably small dispersion in both the thin and thick disk sequences of stellar age and [α/Fe]. Errors on age determinations are described in the text. On [α/Fe], the 0.02 dex error is taken as representative of the internal errors given in Adibekyan et al. (2012).
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