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Fig. 11
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Drift velocities and collision timescales. Top: drift velocities for IC63 (blue), Horsehead (red), and the Orion Bar (green) with nH varying from 104 to 105 H cm−3. Bottom: collision timescales between an AMM grain with size a colliding with another AMM with size a0 ∼ 0.05 μm.
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