F1 and F2 measurements for hVd vowels from the Nationwide Speech Project, produced by 48 talkers, 4 males and 4 females from each of 6 major dialect regions. Data from Clopper, C. G., Pisoni, D. B., & de Jong, K. J. (2005). Acoustic characteristics of the vowel systems of six regional varieties of American English. The Journal of the Acoustical Society of America, 118(3), 1661–1676. https://doi.org/10.1121/1.2000774. Package compiled by Dave Kleinschmidt based on data available from the NSP website: https://u.osu.edu/nspcorpus/files/2017/05/nsp_acoustic_measures-2l1ssgv.txt
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