Left: stationary radii (v_drift=0) as a function of particle size, computed for different values of mean molecular weight and gas midplane density at the location of the belt (see plot legend). Right: dependence of the radial location of particles on time, assuming ρ_g,0=10⁻¹⁷ g cm⁻³, calculated using the steady-state drift approximation. In both panels, the horizontal grey line shows the dust release radius of 65 au. The Gaussian profile width is assumed to be the same in all calculations here (σ_g=15 au). For details, see Section 4.3.