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Fig. 1

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The collision rate between dust aggregates as a function of particle mass to particle mass measured one simulation of Paper II (the MMSN model with ID Mt1d-4m100). Initially particles grow due to Brownian motion and collisions between equal sized aggregates are frequent. When turbulent relative velocity dominates over Brownian motion (masses above 108 g), collisions between equal sized aggregates are less frequent and collisions between different sized aggregates are dominant.

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