| 1. | The vertical axis of the chart is mapped by vowel height.
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| 2. | This is consistent with the general correlation between rounding and vowel height.
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| 3. | Taos has six vowels with three contrastive vowel heights and degrees of vowel backness.
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| 4. | Otherwise, languages are not known to contrast more than four degrees of vowel height.
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| 5. | Phonemically, Tatar may be argued to have two vowel heights, mid-centralized.
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| 6. | Differences in vowel height, backness and / or diphthongal quality may have played a role.
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| 7. | The first formant, abbreviated " F1 ", corresponds to vowel openness ( vowel height ).
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| 8. | Portuguese, as Catalan, uses vowel height, contrasting stressed and unstressed ( reduced ) vowels.
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| 9. | A notable feature of Chukchi is its vowel harmony system largely based on vowel height . alternate with, respectively.
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| 10. | This description distinguishes four degrees of vowel height and a rounding contrast ( rounded vs . unrounded ) between back vowels.
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