Fig. 4.

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Sample used in this study divided in three separate intervals of mean radius: 0–6 kpc (top panels), 6–9 kpc (middle panels), and 9–20 kpc (bottom panels). The number of stars above the line at [α/Fe] = 0.15 and younger than 4 Gyr is indicated on each plot. All the stars in this figure were selected to have an error on age below 3 Gyr.
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