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Fig. 1

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Dust surface density distributions as function of radius and grain size at 104, 106, and 3 × 106 years. In this simulation, the turbulence parameter αt was taken to be 10-3. Overlayed are the representative sizes for a fragmentation limited size distribution (solid black lines) and for a drift limited size distribution (dashed black lines) according to Eqs. (8) and (18), respectively. The dash-dotted line denotes the time-dependent estimate of the largest grain size a1(t) as defined by Eq. (28).

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