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Thank you! The tipa manual I had was an earlier version. The new one does not contain a specific command for this symbol, but the command string you supplied works wonders.

Many thanks - I'm new to TIPA, but this worked.
Another question: vowel glottalization appears in some IPA conventions with an apostrophe above the vowel. Is there a way to produce this in TIPA--I've tried several possibilities using \*' but without success so far.

How do I add accents/diacritics both above and below a single vowel at the same time (e.g., macron and subbar, or tilde and subbar)?