Figure 8. Comparison of midplane and 3D diffusion. This figure displays the surface density of particles as a function of the distance to the star at four different epochs. The disk has a surface density decreasing as r−1 and α = 0.01. Solid line: 3D simulation; dashed line: 2D simulation in which particles are confined to the disk’s midplane. The particle’s radius is 0.1 μm.
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