Fig. 4
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[Fe/H] as a function of ages from Gaia DR2 for the full sample (upper panel) and for the subsample of stars with errors in age lower than 1.5 Gyr. The different stellar populations are depicted with different colors and symbols as explained in the legend. The average and standard deviation of [Fe/H] in 1 Gyr size bins are shown with a black line and error bars.
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