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Fig. 5.
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Time evolution of radial [Fe/H] gradient. The circles are colour-coded by cluster ages. The three solid lines are the weighted linear regressions and the dashed curves are lowess models for the three age bins: age < 1 Gyr (red), 1 Gyr ≤ age < 3 Gyr (beige), and age ≥ 3 Gyr (green).
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