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Fig. 4
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Ratios of PO/PN as a function of time in the diffuse and translucent cloud model: a) ζCR = 1.3 × 10−16 s−1 and ζX = 1 × 10−17 s−1; b) ζCR = 6.3 × 10−17 s−1 and ζX = 5 × 10−18 s−1; and c) ζCR = 1.3 × 10−17 s−1 and ζX = 1 × 10−18 s−1. The dashed line signifies the threshold at which PO/PN equals 1.
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