R graphs differ from exported one

Hello everybody! This is my first mail so I'll write a couple of lines
of self-introduction.
My name is Massimiliano, I'm from Italy and I'm studying Mathematical
Engineering.
I started using R in my Statistics course and have to use it to make a
project which I'll discuss at the end of the course.

The problem I'd like to ask you about follows.
Suppose I have imported a datafile with the classic command

dat <- read.table('file', header=T)

and wanted to see if my data are Normal-like or not.
I can accomplish this with the command

qqnorm (col)

where 'col' is the column in the datafile 'file'.
Now, the graph that appears is very nice: indeed it has a title, two
axes with their labels and all the rest;
but when I give commands

postscript(file="plot.eps", onefile=FALSE)
qqnorm (col)

to save the graph to a file "plot.eps" to include it in a TeX, the file
created has nothing to do with the former one: it only has "the graph
part", i.e. no title, no labels, no axes....

I searched in the documentation but found nothing; the same on the
forum.
What should I do?
I'm running R 2.12.1 on Ubuntu Linux 10.04 LL 64-bit

Thanks for help to everybody :)
Massimiliano


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