Fig. 5
Relative abundances for a carbon-rich gas (C/O = 1.5, solid lines) and for an oxygen-rich gas (C/O = 0.66, dashed lines) for: a) O-bearing molecules; b) C-bearing molecules; c) S-bearing molecules; d) CN and HCN. The vertical line indicates the boundary between the H2 and CO regions. The line at the top indicates the H2 and CO regions in the nebula.
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