Same as Figure 3, but with colors representing different quantities. The colors in the left and right panels represent the peak dust-to-gas surface density ratio in the Drift model, Z_peak,eq, and the equivalent dust-to-gas inflow mass ratio in the Ring model, x_eq, respectively. The latter is calculated by equating the total dust mass in the CPD with the dust mass that would be supplied over 5.4 Myr for x_eq.