| during this reaction | 6 | temporal |
| from an external source | 3 | other |
| during waterfloods | 3 | temporal |
| oxygen → be → added | 48 |
| oxygen → be → introduced | 25 |
| negative | neutral | positive |
| 0.175 | 0.709 | 0.116 |
| Raw frequency | 73 |
| Normalized frequency | 0.668 |
| Modifier score | 0.280 |
| Perplexity | 87.988 |