| Keyword | CPC | PCC | Volume | Score | Length of keyword |
|---|---|---|---|---|---|
| pnas reference | 1.59 | 0.9 | 8938 | 66 | 14 |
| pnas | 0.9 | 0.5 | 9046 | 75 | 4 |
| reference | 1.94 | 1 | 1687 | 44 | 9 |
| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| pnas reference style | 0.13 | 0.7 | 3342 | 56 |
| pnas reference | 1.96 | 0.8 | 5077 | 39 |
| pnas reference format | 1.65 | 0.2 | 8278 | 30 |
| reference number pnas | 1.09 | 0.4 | 5513 | 43 |
| pna phase reference calibration | 0.58 | 0.5 | 6362 | 27 |
