Fig. 17
Constant density, photochemical models as a function of cloud visual extinction (AV) for χ = 2 × 104. Left: nH = 4 × 104 cm-3 characteristic of a moderate density interclump medium; right: nH = 4 × 106 cm-3 characteristic of higher density clumps. We note the different spatial scales, thermal profile, and molecular abundance and ionisation fraction gradients implied by the two models.
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