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Fig. 4.

image

Difference in the density of neutrals between simulations P and P-I0 at t = 250.7 s. For each simulation the density of neutrals obtained after evolving the unperturbed equilibrium has been subtracted: P′≡P − Peq; (P-I0)′ ≡ P-I0 − (P-I0)eq.

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