It works with segments or arrows :-) x<-rnorm(10) y<-rnorm(10) plot(1:10,x) points(1:10,y, col=2) segments(1:10,y,1:10,x) -- View this message in context: http://www.nabble.com/Overlaid-plots---lines-tp21828330p21829804.html Sent from the R help mailing list archive at Nabble.com.