Fig. 2

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Ratio of the particle surface density relative to the gas surface density for simulations with box sizes L = Lx = Ly = 6.4, 3.2, 1.6, 0.8 H (white frames). The colour scale ranges from 0.0 to 0.05 (the mean surface density ratio in the simulations is 0.02). The nominal box size for streaming instability simulations used in most other work (L = 0.2 H) is indicated with a black frame for reference. The filamentary structure appears similar in the four box sizes.
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