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Fig. 12

image

Relevant physical and chemical timescales relative to the local dynamical timescale. The chemical timescale is inversely proportional to the local UV flux (parametrised by G0): higher UV flux leads to faster chemical timescales. For the standard interstellar UV flux (G0 = 1), the chemical timescale is smaller than the vertical mixing timescale only outside 30 AU.

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