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Table 9
Summary of the properties of the tracers.
| Species | Region traced | Gas traced | Warm-up sensitivity |
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| CH3CN | Dense envelope, hot core | Warm, hot | Good |
| CH3CCH | Dense envelope | Warm | Good |
| CH3OH | Envelope, hot core | Cold, hot | Fair |
| C17O | Envelope, dense envelope | Cold, warm | Fair |
| NH3 (1, 1) & (2, 2) | Envelope | Cold | Low |
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