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Fig. 7

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Surface density of solids Σsolid as a function of the radial coordinate x, evaluated at two points in time 25 orbits apart (first blue, then green). The top plot is in the suspension regime (particle size τf = 0.001) and has solid concentration Z = ⟨ Σsolid ⟩ / ⟨ Σtotal ⟩ = 0.095. In this regime, there is very little clumping even at high Z. The middle plot is the beginning of the streaming regime (τf = 0.003) and Z = 0.095. In this regime, clumps form and are stable. The bottom plot is in the radial drift regime (τf = 3) with Z = 0.05. In this regime particles form large over-densities that experience rapid radial drift.

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