| Features | Principal components | |||
| υ1 | υ2 | υ3 | υ4 | |
| t12 | 0.3601 | 0.6662 | 0.6551 | −0.0312 |
| t11 | 0.5131 | 0.4501 | −0.7216 | −0.0759 |
| fg | −0.5327 | 0.4520 | −0.1821 | 0.6901 |
| fw | −0.5723 | 0.3836 | −1123 | −0.7226 |