Great. Thanks. Here is the new code: xyplot(Y~X,groups = TRT,type="n") text(x,y,labels=TRT) -- View this message in context: http://r.789695.n4.nabble.com/Plot-using-treatment-letter-as-points-tp3276743p3276808.html Sent from the R help mailing list archive at Nabble.com.