| from kansas’s natural gas fields | 3 | location |
| level → be found in → sample | 7 |
| level → be measured in → sample | 4 |
| level → be observed in → sample | 3 |
| negative | neutral | positive |
| 0.262 | 0.672 | 0.066 |
| Raw frequency | 14 |
| Normalized frequency | 0.275 |
| Modifier score | 0.500 |
| Perplexity | 57.374 |