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Wikipedia says "/e, o/ are mid [e̞, o̞]" [1]
>The mid front unrounded vowel is a type of vowel sound that is used in some spoken languages. There is no dedicated symbol in the International Phonetic Alphabet that represents the exact mid front unrounded vowel between close-mid [e] and open-mid [ɛ], but it is normally written ⟨e⟩.
What's your source for this? Wikipedia says "/e, o/ are mid [e̞, o̞]" [1]
>The mid front unrounded vowel is a type of vowel sound that is used in some spoken languages. There is no dedicated symbol in the International Phonetic Alphabet that represents the exact mid front unrounded vowel between close-mid [e] and open-mid [ɛ], but it is normally written ⟨e⟩.
[1] https://en.wikipedia.org/wiki/Japanese_phonology?wprov=sfla1