Mass ratio of volatile molecules relative to the mass of solids in the planets, as a function of initial and final semi-major axis a_pl, for non-irradiated (upper panel) and irradiated (lower panel) models. The blue area corresponds to the ice water line position for most simulations. Gray area corresponds to the zone of stability of ices beyond the ice line. Models without refractory organics assume CO:CO₂ = 1:1.