[R] biplot graphical problems

[Stacul Edoardo]

Hello,

I have a graphical problem concerning a biplot that I was ask to insert
in a scientific work to be published.

I've performed a princomp analysis and produce the relative biplot but
the labels of variables are out of margin (see attached file).

When I try to wide the x axis by the function xlim=c(i:j), nothing
happens if not a partial shift of the x range. Is there any specific
command able to solve this problem?

Thanks in advance,

Edoardo