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Fig. 13

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Time between sticking collisions. The figure shows the three 1282 runs from Fig. 11 plus two higher-resolution runs. In all runs the particle size is τf = 0.003 and Z = Σsolid/ Σtotal = 0.074. We fit a Maxwellian distribution to to all particle pairs with separation less than D. Extrapolating the fit toward small D we estimate the time between sticking collisions. The points on the figure appear to follow a power law tstickD2. The region in green corresponds to the 1σ confidence region marked in Fig. 10. The figure shows that tstick< 105 years is a robust upper bound on tstick.

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