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Fig. 9


Line ratios as functions of outer abundance, inner abundance and gas to dust ratio (g/dgas). One line ratio in the P branch (P(15):P(51)) (top panel), one line ratio in the R branch (R(7):R(39)) (middle panel) of the 0110 → 0000 15 μm transition are shown together with the line ratio between the 13CO2Q-branch and the neighbouring 12CO2P(25) line. See the main text for more details.

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