[XeTeX] vertically aligned sub and superscript

[Manuel Souto Pico]

Hi,

I would like to know if it's possible to have a subscript and a superscript
at the same and vertically aligned.

What I'm doing now is x_{a}^{b} o x^{b}_{a} but a and b are not aligned.

Thank you very much for your help,

Cheers, Manuel
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