[PyMOL] Font size with cyl_text

Hi,

I'm trying to add some labels to a diagram using the cyl_text method, 
but I can't find any way to change the font size. In the only example 
I've found:

# draw text using cgo
from pymol import cmd
from pymol.cgo import *
from pymol.vfont import plain

cgo = []
axes = [[2.0,0.0,0.0],[0.0,2.0,0.0],[0.0,0.0,2.0]]
pos = [0.0,-3.0,0.0]
cyl_text(cgo,plain,pos,'Hello Universe',0.10,axes=axes)
cmd.load_cgo(cgo,'txt')
cmd.zoom("all",2.0)

Changing the '0.10' parameter only alters the thickness of the text, 
not the font size. Is there a way of altering font size here?

Alex Gutteridge
European Bioinformatics Institute
Cambridge CB10 1SD
UK

Tel: 01223 492550
Email: al...@eb...