Summary of the properties of the tracers.
|Species||Region traced||Gas traced||Warm-up sensitivity|
|CH3CN||Dense envelope, hot core||Warm, hot||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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