| Share | Phrase |
|---|
| 16.67% | perturbation fprt |
| 11.25% | perturbation control |
| 7.77% | perturbation in ratio |
| 7.08% | pressure perturbation |
| 5.85% | ratio perturbation |
| 5.27% | perturbation amplitude |
| 4.99% | carry out perturbation [perform operation] |
| 4.23% | perturbation frequency |
| 4.00% | perturbation [does] occur |
| 3.81% | cause perturbation [perform operation] |
| 3.57% | perturbation quantity |
| 3.40% | perturbation means |
| 3.35% | perturbation sequence |
| 3.25% | execute perturbation [perform operation] |
| 2.60% | perturbation effect |
| 2.28% | perturbation [does] cause |
| 2.26% | perturbation number |
| 2.15% | perturbation component |
| 2.14% | fuel perturbation |
| 2.04% | prevent perturbation [perform operation] |
| 1.95% | perturbation signal |