| Method | Description |
|---|---|
| Mid | Midpoint of the vowel |
| OneThird | One-Third point of the vowel |
| Three | Average of one-third, midpoint, and two-thirds points of the vowel |
| MidAll | Average of all points at 10-ms time steps between one-third and two-thirds |
| Full | Average of all points at 10-ms time steps from the start to the end of the vowel |