| PSM A | |||
| Component | Symbol | Mole fraction | Uncertainty |
| Carbon monoxide | CO | 2.500 × 10−7 | 0.012 × 10−5 |
| Carbon dioxide | CO2 | 2.500 × 10−7 | 0.012 × 10−5 |
| Total hydrocarbon | CxHy | 2.500 × 10−7 | 0.012 × 10−5 |
| Helium | He | 19.020 × 10−2 | 0.010 × 10−3 |
| Hydrogen | H2 | 80.976 × 10−2 | 0.010 × 10−3 |
| Water | H2O | 1.000 × 10−6 | 0.048 × 10−5 |
| Nitrogen | N2 | 2.310 × 10−6 | 0.012 × 10−4 |
| Oxygen | O2 | 1.000 × 10−6 | 0.048 × 10−5 |