Fig. 6.
Upper panel: metallicity distribution function for stars in the sample with zmax < 300 pc (to sample mostly thin-disc stars) divided into different age intervals. Stars having age < 1 Gyr are shown in orange, 1 ≤ age Gyr−1 < 5 in red and age ≥ 5 Gyr in blue. The standard deviation (σ) of the [Fe/H] distribution in each age bin is reported in the legend.
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