[XeTeX] font size in points

[Thomas Hühn]

Hi

This may be a stupid question, but how do I request a specific font size
in the fontspec-command?

I have "\fontspec[Mapping=tex-text]{Adobe Garamond Pro}" and would like
to get a size of 9 points. Or 13 points. How do I do that?

"Scale=x" might be a workaround, but how do I do it properly?

Greetings
Thomas