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Hi all! I new to R (I don't know anything about S+ either!) I've a simple question: How do I generate overlay plots in R? So far as I can see the plot(x, y) operator will only give me one graph and the plot(x ~ y + z) will give me 2 separate plots. Is there an easy way to overlay or am I missing the obvious? Any help welcome. Gerard Keogh The information in this email, and any