[R] producing colour .eps output

[RICHARD PITMAN]

I am using the following code to produce a graphic:

library(lattice)
postscript("figs%03d.eps", width = 6.0, height = 6.0,
           horizontal = FALSE, onefile = FALSE, paper = "special")
xyplot(cases~yr|agrp*sex,data=data[tse==0 & expgrp==1,],
       groups=source, pch=".", type="l",
       main="Exposure group 1, time since entry 0")


The resulting figure is in black and white and I can not seem to find a way to get colour output.

Any pointers gratefully received.

TIA

Richard