Vowel Plot
An F1/F2 plot of all the vowels in The North Wind and the Sun passage is shown in Figure 6. The first two formants were measured using Praat (Boersma & Weenink, 2016), and ellipses have been drawn to enclose about 68% of the tokens using the vowel-plotting utilities developed by McCloy (2012). As can be seen, there is substantial variation in the realisation of each of these vowels, especially /a/, but as there are just three vowels occupying the vowel space, there is almost no overlap between them.
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Figure 6. Acoustic quality of all the vowels from The North Wind and the Sun passage.