Text in plots

Hi there,

I've added some test to my plots with:

diff <- ma - m
mtext(substitute(Delta == that, list(that=diff)), side=3, adj=0, line=0, cex=0.8)

Now I want to add a "V" and tried this:

mtext(substitute(list(Delta, italic(V)) == that, list(that=diff)), ...)

but this plots a comma between Delta and V. How can I add Delta V
without the comma?

Thanks, Sven
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