Table 1. F1 and F2 average values and associated standard error (in Hz) for each vowel for the three days tested.
| Vowel | Day | F1 in Hz (St. Error) | F2 in Hz (St. Error) |
|---|---|---|---|
| AE | 1 | 848.74 (33.748) | 1801.301 (55.05) |
| AE | 2 | 847.624 (32.035) | 1785.092 (58.835) |
| AE | 3 | 855.225 (35.872) | 1804.339 (69.111) |
| AH | 1 | 888.876 (34.106) | 1396.303 (62.624) |
| AH | 2 | 898.628 (33.324) | 1368.614 (67.994) |
| AH | 3 | 894.236 (34.113) | 1346.137 (69.287) |
| EE | 1 | 336.558 (24.094) | 2551.42 (64.665) |
| EE | 2 | 343.017 (23.605) | 2488.899 (57.945) |
| EE | 3 | 349.187 (21.477) | 2488.35 (87.477) |
| EH | 1 | 738.531 (43.12) | 1865.417 (56.621) |
| EH | 2 | 735.015 (43.316) | 1843 (33.929) |
| EH | 3 | 744.734 (43.791) | 1838.54 (43.754) |
| IH | 1 | 529.602 (35.291) | 2089.443 (77.148) |
| IH | 2 | 533.456 (35.308) | 2065.498 (53.183) |
| IH | 3 | 535.675 (32.593) | 2076.547 (83.045) |
| OO | 1 | 369.12 (17.602) | 1056.081 (56.582) |
| OO | 2 | 392.923 (18.236) | 1136.223 (110.635) |
| OO | 3 | 385.556 (15.125) | 1083.85 (81.243) |
| UH | 1 | 726.6 (36.937) | 1392.728 (55.943) |
| UH | 2 | 737.705 (30.083) | 1379.591 (50.763) |
| UH | 3 | 748.173 (29.101) | 1377.194 (58.354) |