+Font iwona-math
+ GuiName "Iwona (Math)"
+ Family math
+ Requires iwona
+ Preamble
+ % store roman font
+ \let\origrmdefault\rmdefault
+ \usepackage[math]{iwona}
+ % reset stored roman font
+ \renewcommand{\rmdefault}{\origrmdefault}
+ EndPreamble
+EndFont
+