[NTG-context] Is it possible to have a rotated label in Metafun?

Hi all, In a graph which I am trying to draw with LuaMetafun, I have a variable the values of which I want to show on the graph rotated 90 degrees (or whatever other value). Is it possible to do that? An example is: numeric a, u ; u := 10mm ; a := 4.5 ; label.bot(a, (10,-0.1) scaled u) % I would like to have printed 4.5 rotated 90 degrees for instance. Thanks in advance for any help: Otared