Fig. 9
Results of the UCL CHEM code to model the low-density envelope LHD for a starting CO freeze-out of 10%. The results are given at AV of 41 magnitudes and by setting the temperature fixed to 35 K. The bottom panel shows the ratio of gas-phase CH and c-C3H2 relative to CCH. The vertical dashed line marks the age of 104 years, which is used in Table 6.
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