Example steady-state surface density profiles of millimeter-sized (green) and centimeter-sized (blue) particles, water vapor (dashed lines), and gas, for the disk model with ﹩\dot{M}={10}^{-8}\ {M}_{\odot }\ {\mathrm{yr}}^{-1}﹩. Outward diffusion and condensation of vapor lead to a modest enhancement of the solid surface density outside the snow line for centimeter-sized (and larger) particles.