\input{umtest-preamble}
\usepackage{amsmath}  
\usepackage[math-style=ISO]{unicode-math}  
\setmathfont{xits-math.otf}  
\setmathfont[range=\mathit/{latin, greek, Greek}]{Asana-Math.otf}  
\begin{document}  
$abc$ $ABC$
$\alpha\beta\gamma$
$\Alpha\Beta\Gamma$
\end{document}  
