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When I use e.g. \unit{cm^{3}/s} there is a space between the '3' and the '/'. I can reduce it with \! but is there a more 'proper' way of using the \unit command to reduce this space?

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    The space comes from \scriptspace that's always added after an atom with a subscript or superscript. Its default value is 0.5pt. Maybe JW can find a method for removing the \scriptspace in those cases.
    – egreg
    Jul 24, 2019 at 17:36
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    @egreg But that's exactly what the reference rendering does too: $\mathrm{cm}^{3}/\mathrm{s}$.
    – Joseph Wright ♦
    Jul 24, 2019 at 17:37
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    @JosephWright You didn't read chapter 18 of the TeXbook, did you? Particularly the example $x^2\!/2$ on page 169. ;-)
    – egreg
    Jul 24, 2019 at 17:49
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    The problem is not only from \scriptspace, but also from the very shape of /.
    – egreg
    Jul 24, 2019 at 17:51
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    I created a feature request.
    – schtandard
    Jul 29, 2019 at 13:39

1 Answer 1

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Upcoming siunitx v3.1 will offer option per-symbol-script-correction with a standard setting of \! to cover this case. This is automatically inserted where per-mode will use a symbol and the last entry in the numerator has a superscript power.

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