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Fig. 9
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Observed abundances of (a) CO, (b) HCO+, (c) N2H+, (d) HNC, (e) HCN, (f) HNCO, (g) H2CO and (h) CH3OH versus n∏. Astrochemical model results are also shown for ζ = 10−18 s−1 (dotted lines), 10−17 s−1 (solid lines) and 10−16 s−1 (dashed lines) with other parameters set to be T = 15 K and Av = 20 mag.
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