Age-metallicity relation for Selene disc particles in four radial bins (current positions); every point represents a stellar particle colour-coded according to its R_current − R_birth. Distribution of plots as in Fig. 12 (regions 1 to 4). Dashed cyan vertical lines are located at t_jump. We must highlight that, although the colour-coded range goes from −4 to 4 kpc, we plot all the disc particles in that region, i.e. light green (dark blue) really means R_current − R_birth ≥ 4.0 (R_current − R_birth ≤ − 4.0).