Apologies Greg for asking you more but what is tmp[,1] doing, I've tried googling it and looking here for it but it's not making sense. A -- View this message in context: http://r.789695.n4.nabble.com/Customise-a-symbol-in-a-scatterplot-with-for-loop-tp4687386p4687470.html Sent from the R help mailing list archive at Nabble.com.