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Fig. 6


Trial abundance models 1, 2 and 3 for H2CO. The H2CO abundance is limited by photodissociation in the upper layer and freeze out below 60 K. Model 1 assumes a constant abundance, model 2 assumes a fractional abundance with respect to CO, model 3 assumes a constant abundance in between 60 and 70 AU radius and zero abundance at other radii.

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