Age–metallicity and age–[α/Fe] distributions, with stars in the metal-poor tail of the thin disk sequence (see Fig. 1) at [Fe/H] < −0.3 dex shown as white dots. The metal-poor thin disk stars draw a sequence parallel to the local thin disk, joining the thick disk at 9−10 Gyr and [α/Fe] in [0.1,0.15].
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