Total number of predicted stars (N_★) as a function of the Galactocentric distance and the Galactic time. Upper panel: Results from the reference model without including stellar migration. Middle panel: Results from the model incorporating stellar migration, as described in Section 2.2, with the radial migration strength fixed at σ_RM = 3.5. Lower panel : Same as the middle panel but with a radial migration strength of σ_RM = 6. In each panel, we highlight with a green cross the maximum number of stars computed at 12 kpc.