Fig. 10
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Dependence of the ratio of the VDF of the upper-level to the Maxwellian distribution at τ = 1 (namely, f2(u,τ = 1)/fM(u)) on the phase-changing elastic collision rate qE/A21 (indicated in the figure legend). With increasing values of qE/A21, the departure of the f2 from Maxwellian initially increases (until qE/A21 = 0.5) and then decreases.
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