Radial evolution of grains in the (R, S0) plane showing that a grain in the Epstein drag regime ends its radial motion in the A-mode. The solid curves represent R − p for various values of p, they separate the A-mode (below) from the B-mode (above) regions. The horizontal dashed lines show trajectories of grains as they migrate inwards from R = 1. The shaded area is a forbidden zone.
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