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Table 4
Mass fraction of CO-dark gas.
| Cloud category | f-median | ⟨f⟩ ± 1σ | Tracer |
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| Diffuse molecular | 0.78 | 0.77 ± 0.12 | No CO |
| Transition molecular | 0.42 | 0.43 ± 0.18 | 12CO, no 13CO |
| Dense molecular | 0.18 | 0.21 ± 0.15 | 13CO |
| Dense cores | 0.12 | 0.16 ± 0.12 | C18O |
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| All [C ii] sources | 0.41 | 0.44 ± 0.28 | |
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