Fig. 4
Radial evolution of grains in the (R,S0) plane showing that a grain in the linear Stokes drag regime ends its radial motion in the B-mode. The solid curves represent 
for various values of q, 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. Shaded area: forbidden.
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