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Table 2
Complementary ground-based observations of dense gas tracers.
| Molecule | Transition | Frequency (MHz) | Telescopes |
|
|
|||
| CS | 2–1 | 97 980.950 | IRAM 30 m |
| 7–6 | 342 883.000 | APEX | |
| HCO+ | 1–0 | 89 188.523 | IRAM 30 m/Mopra |
| 4–3 | 356 734.134 | APEX | |
| HNC | 1–0 | 90 663.593 | IRAM 30 m/Mopra |
| 4–3 | 362 630.303 | APEX | |
| HCN | 4–3 | 354 505.476 | APEX |
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