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. Author manuscript; available in PMC: 2011 Mar 18.
Published in final edited form as: Speech Commun. 2006 Jun 1;48(6):633–644. doi: 10.1016/j.specom.2005.09.010

Fig. 5.

Fig. 5

Mean vowel spaces for each of the six dialect regions included in the NSP corpus. The vowels proceed from left to right: i, ɪ, e, ε, æ, ɑ, ɔ, Λ, o, ʊ, u. Each data point represents the average first and second formant frequencies of the vowel obtained from five hVd productions from each of four male and four female talkers in the NSP corpus. Replotted from (Clopper et al., 2005b).