Package charter breaks siunitx \micro #7
Description
The package charter, loaded in teaching.cls, breaks the font for the text-mode greek μ, resulting in a slanted prefix (which is wrong and ugly ;-)):
The fix (hack?) is adding
\DeclareSIPrefix\micro{\ensuremath{\upmu}}{-6}(upgreek must be loaded):
MWE:
\documentclass[spanish]{teaching}
% without this line the "μ" is slanted (wrong)
\DeclareSIPrefix\micro{\ensuremath{\upmu}}{-6}
\Subject{subject} % needed, errors if not given
\begin{document}
sensibilidad \SI{60}{\uV\per\kelvin}
$S_{TP}=\SI{60}{\uV\per\kelvin}$
\end{document}