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Table 3
Line ratios.
| Line ratio | i12 | g327 | i16 | ngc | i17 | b2n | b2m | g10 | g31 | g34 | w51d | w51e |
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| HCN, v2 = 1 / HC15N, v = 0 (4–3) | 0.25 | 0.7 | 0.6 | 0.5 | 0.8 | 1 | 1.5 | 1 | 0.3 | 0.25a | 0.9 | 0.3 |
| H13CN, v2 = 1/HC15N, v = 0 (4–3) | <0.1 | 0.3 | 0.1 | <0.15 | 0.08 | 0.5 | 0.7 | 0.7 | <0.15 | <0.1a | <0.2 | <0.15 |
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| H13CN, v = 0 / HC15N, v = 0 (4–3) | 4 | 1.5 | 2.5 | 2.5 | 2 | 0.8 | 4.5 | 3.5 | 3 | 2.5a | 3.5 | 2.8 |
| H13CO+ / HC18O+ (4–3) | 10 | 4 | 8 | 5 | ... | 2 | 4 | >2 | 3.5 | ... | >5 | 3 |
| 13CO / C18O (8–7) | 2.5 | 2 | 2.3 | 3.3 | 1.8 | 2 | 1.3 | 1.3 | ... | 2.5 | 4.4 | 2 |
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