[XeTeX] Math with font Iwona

[Pavel Stranak]

Hello,

I would like tu use Iwona in Xelatex for all the math.

I saw some results of \usepackage[math]{Iwona} in Latex in the math  
fonts survey on CTAN:
http://ctan.tug.org/tex-archive/info/Free_Math_Font_Survey/
I like the result.

I tried this with fontspec:
\setmainfont[Mapping=tex-text]{Minion Pro}
\setsansfont[Mapping=tex-text,Scale=MatchUppercase]{Iwona}
\setmathrm{Iwona}
\setboldmathrm{Iwona Bold}
\setmathsf{Iwona}
\setmathtt{Courier}
\setmonofont[Scale=MatchUppercase]{DejaVu Sans Mono}

In the result there is a mix of Latin Modern and Iwona (see the  
attachement).
So is it possible to emulate \usepackage[math]{Iwona} in Xelatex?

Thanks,

Pavel
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