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Percentages of spectral level profile (SLP) overlap of the hearing range given for three vowels, as well as the overall maximum SLP across all vowels (as shown in Figure 3).
| Untrained | Trained | |||||||
|---|---|---|---|---|---|---|---|---|
| /i/ | /a/ | /u/ | overall | /i/ | /a/ | /u/ | overall | |
| Soprano | 36.9 | 35.3 | 31.4 | 37.8 | 36.8 | 43.5 | 40.1 | 44.0 |
| Mezzo-Soprano | 36.9 | 32.8 | 34.9 | 38.1 | 41.6 | 45.6 | 37.3 | 46.2 |
| Tenor | 35.2 | 29.9 | 23.2 | 35.8 | 45.4 | 43.0 | 42.9 | 46.4 |
| Bass-Baritone | 36.5 | 42.9 | 34.9 | 43.1 | 41.1 | 39.7 | 34.2 | 42.4 |
|
| ||||||||
| Average | 36.4 | 35.2 | 31.1 | 38.7 | 41.2 | 42.9 | 38.6 | 44.8 |
