Ratio between the surface density of high-temperature condensates, Σ_pot.CAI, and the surface density of all refractory particles, Σ_tot.ref, for different values of α₀ and T_infall = 100 kyr. These simulations assume the nominal fragmentation thresholds of 1 m s⁻¹ and 10 m s⁻¹ for dry and icy particles, respectively. The three solid white lines are, from closest to the star to farthest, the sublimation lines of refractories, silicates, and water. The white course dashed line is R_C, and the fine dashed line is the dust disk size, .