Table D.1.
Default isotopologue ratios used in this study.
| Species | Relative abundance |
|---|---|
 |
99.7% |
| HD16O | 4 × 10−5 |
 |
2 × 10−3 |
 |
3.7 × 10−4 |
| HD18O | 6.2 × 10−8 |
| HD17O | 1.1 × 10−8 |
| 12C16O | 98.7% |
| 13C16O | 1.1% |
| 12C18O | 2 × 10−3 |
| 12C17O | 3.7 × 10−4 |
| 13C18O | 2.2 × 10−5 |
| 13C17O | 4.1 × 10−6 |
| CH4 | 98.8% |
| CH3D | 8 × 10−5 |
Notes. The values were taken from the molparam.txt file of the HITRAN/HITEMP databases, which are based on the compilation of telluric isotopic abundances by De Biévre et al. (1984). Because the Earth is 10-fold enriched in deuterium when compared to the mean galactic value, the relative abundances of D-bearing isotopologues were adjusted such that D/H = 2 × 10−5.
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