use plot() for the x1,y1 points
use points() for x2,y2 points
x1<-seq(1:10)
x2<-seq(2:12)
y1<-x1+rnorm(length(x1))
y2<-.1*x2+rnorm(length(x2))
plot(x1,y1,xlim=range(x1,x2), ylim=range(y1,y2), pch=1)
points(x2,y2,pch=2)
Bill
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