Age-[Fe/H] relation for the model 3INF-1 in different radial ranges, i.e. R < 7 kpc (left panel), 7 < R/kpc < 9 (central panel), and R > 9 kpc (right panel), including stellar migration and OC spread (see Sact. 3.4). The density plot show the normalised density of stars (in log scale) as predicted by the model in a given age bin of 0.25 Gyr width. Lines are genuine chemical tracks at 6, 8, and 10 kpc (solid) and 4 and 12 kpc (dashed). Filled circles represent the restricted sample within OCs in Magrini et al. (2023).