German vowel charts used in the wikipedia article Standard German phonology do not locate vowels with great details. For example German [e] is a bit higher than the IPA [e] (something like what is shown in this vowel chart) or tense vowel [e:] is not produced exactly in the same location of its allophone short vowel [e]. the wikipedia charts are phonemic oriented for example [e:] and [e] are grouped together as "e(:)"
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2I suggest getting a print article with a vowel chart, where vowel symbols can be more precisely located. IPA sketches are good for getting impressions of vowel positions.– user6726Aug 31, 2018 at 14:38
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5Standard German arguably does not have an exactly defined pronunciation.– Adam BittlingmayerAug 31, 2018 at 14:46
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Oh, got it, you are talking about the allophonic use of [e] for /eː/ in unstressed syllables in Latinate words?– brass tacksAug 31, 2018 at 17:04
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@sumelic. exactly– HoumanAug 31, 2018 at 17:09