Own work, based on the vowel charts in Beaken, Michael Alan (1971) A study of phonological development in a primary school population of East London (Doctoral thesis)[1], UCL, page 197. /ɪː/ and /eː/ correspond to the centering diphthongs /ɪə/ and /eə/ in traditional RP. In cockney, they contrast with /ɪ/ and /e/ mainly by the length, rather than the presence of a centering glide. The same can be said about /ɔː/ vs /ɔ/ and /æː/ vs. /æ/. /æː/ has an alternative realization [æw], shown on the chart.
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