[R] postscript, greek lellters

[bernardo lagos alvarez]

Dear useRs,

How can I, writting the correct greek letter using postscrip or pdf function.

In my  figures appears  only the first letter  (a of alpha, n of nu)
when include the graphs in my .tex doxument. I am using

title( expression(bar(T)(paste(-x,";",alpha))-G(paste(x,";",alpha,",",J))))
title( expression(bar(T)(paste(-x,";"~alpha))-G(paste(x,";"~alpha,",",J))))
title( expression(bar(T)(paste(-x,";"*alpha))-G(paste(x,";"*alpha,",",J)))),
not work.

>sessionInfo()
R version 2.9.0 (2009-04-17)
i386-pc-mingw32

locale:
LC_COLLATE=Spanish_Spain.1252;LC_CTYPE=Spanish_Spain.1252;LC_MONETARY=Spanish_Spain.1252;LC_NUMERIC=C;LC_TIME=Spanish_Spain.1252

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base


Thanks for your help,

Bernardo.