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Fig. 5

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Left panel: modeled depletion of gas phase PAHs on cold interstellar grains as a function of cloud density. Right panel: modeled time-dependent PAH loss and PAH photoproduct growth in a PAH:H2O ice mantle within a cloud experiencing AV = 3 mag of visual extinction. It is explicitly assumed that H2O ice photodesorption is not efficient enough to act rate limiting.

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