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Fig. C.1.

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Predicted physical (roughly vertical) structure of the PDR component of d203-506. Upper panel: Gas density and temperature profiles as a function of depth into the PDR. Middle panel: Abundance profiles of selected species. Lower panel: Column densities as a function of depth into the PDR of small hydrocarbons detected by JWST in d203-506 (see also Berné et al. 2024; Zannese et al. 2025).

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