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Table 1
Description variables.
| Variable | Quantity | Unit |
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| ICO | Observed 12CO(2–1) integrated intensity | K km s-1 |
| IH i | Observed H i 21cm integrated intensity | K km s-1 |
| N(H i) | Atomic gas column density | cm-2 |
| N(H2) | Molecular gas column density | cm-2 |
| ΣH i a | Atomic gas surface density | M⊙/ pc2 |
| ΣH2a | Molecular gas surface density | M⊙/ pc2 |
| Σgasa | Total gas surface density | M⊙/ pc2 |
| Σdusta | Dust surface density | M⊙/ pc2 |
| σΣdust a | Uncertainty on dust surface density | M⊙/ pc2 |
| αCO a | Conversion factor from ICO to H2 mass surface density | M⊙/ (pc2 K km s-1) |
| XCO | N(H2) /ICO Conversion factor from ICO to H2 column density | cm-2/ K km s-1 |
| GDR b | Gas to dust mass ratio | unitless |
| Kdark a | CO dark gas surface density | M⊙/ pc2 |
|
CO dark gas column density | cm-2 |
| κ | Dust opacity | cm2/ g |
| β | Dust emissivity index | unitless |
| σ dust | Dust cross section | cm-2/ H |
| B ν,T | Black body surface brightness at frequency ν and temperature T | Jy/sr |
| Zgas | gas-phase-metal-fraction | unitless |
| mp | Proton mass | g |
Notes.
(b)
GDR is the same quantity as δGDR in Leroy et al. (2011).
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