All vowels in the analysed section of speech were impressionistically coded for phrasal stress as discussed above in the Methods chapter. This section examines the role of stress in phonetic implementation by considering the effects of phrasal stress on the phonetic quality of (acoustic) vowel nuclei.9.22 In most of the stress studies in this book, the results presented are limited to the means of the distributions of stressed and unstressed vowel classes. Here I would like to give the reader a feeling for the degree of overlapping that is involved between stressed and unstressed subsets of a vowel class; this is not done for other chapters. So the first section below discusses sets of charts of raw measurements, while the second discusses the relational patterns using only the means, as is done in the other chapters.