Relative velocities between compact (left) or very porous (right) particles with masses mi and mj at the midplane of an MMSN-disk at 5 AU with α = 10-3. The masses range from single monomers to aggregates containing 1032 monomers. The contours give relative velocities in m s-1, and the colors indicate the dominating source for the relative velocity: Brownian motion (BrM), turbulence (Trb), settling (Set), radial drift (Rad), or azimuthal drift (Azi). Epstein, Stokes, and Newton drag regimes have been taken into account.
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