A number or expression that is set higher than the baseline and slightly smaller, to act as a superior or superscript
(#PCDATA | ext-link | related-article | inline-supplementary-material | bold | italic | monospace | overline | roman | sans-serif | sc | strike | underline | alternatives | inline-graphic | target | xref | sub | sup)*
Any combination of:
... <p align="left">The value of <inline-graphic xlink:href="met_12_3_317_ig1.tif"/> depends on the parameters μ, τ<sup>2</sup>, and σ<sup arrange="stack">2</sup><sub arrange="stack"><italic>k</italic></sub>. If the true values of these parameters are known, then ...</p> ...
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