Mean equilibrium radial drift velocity as a function of Stokes number (τ_s) for runs SI41-4-2-d and SI30-4-2-d measured from the time of saturation. The vertical bars show the 1σ variation of the radial velocity and are measures of the radial diffusion each species experiences. The red stars represent the single species equilibrium solutions. The green and blue circles show the multispecies radial equilibrium velocity near the midplane. The purple and red squares show the height averaged multispecies solution under the assumption that the particle density of each species is distributed uniformly within its scale height. Run SI30-4-2-d was shifted horizontally for illustration purposes.