Fig. 13
Ratio of mean-free path to close-encounter distance as a function of heliocentric distance. The solid lines represent λ∕dce for different values of dce. For the dashed line, this ratio is unity, indicating where the sequential approach breaks down. A value of Σ0 = 10 g cm−2 at 1 au and irms = 5 × 10−5 was used. Surface density is assumed to be a power law 
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