| SRT | Pair of the angular natural frequencies | Is the smallest of the two frequencies the principal one? |
| 1 | 228,463, 685,389 | yes |
| 2 | 228,499, 686,478 | yes |
| 3 | 228,826, 695,624 | yes |
| 4 | 232,716, 816,686 | yes |
| 5 | 272,229, 949,518 | yes |
| 6 | 317,753, 967,498 | yes |
| 7 | 322,499, 969,085 | yes |
| 8 | 323,041, 969,266 | yes |