| PSM 2 | |||
| Component | Symbol | Mole fraction | Uncertainty |
| Argon | Ar | 9.513 × 10−5 | 0.039 × 10−3 |
| Methane | CH4 | 97.986 × 10−2 | 0.472 × 10−4 |
| n-butane | C4H10 | 9.999 × 10−3 | 0.019 × 10−3 |
| i-butane | C4H10 | 1.002 × 10−2 | 0.019 × 10−3 |
| Total hydrocarbon | CxHy | 1.483 × 10−5 | 0.060 × 10−4 |
| Hydrogen | H2 | 2.450 × 10−7 | 0.014 × 10−5 |
| Water | H2O | 3.950 × 10−6 | 0.023 × 10−4 |
| Nitrogen | N2 | 1.255 × 10−5 | 0.071 × 10−4 |
| Oxygen | O2 | 3.204 × 10−7 | 0.015 × 10−5 |
| Sulfur dioxide | SO2 | 1.006 × 10−8 | 0.041 × 10−7 |