Q1: How can i draw LSD (Least significant difference) on a plot? Like this... http://r.789695.n4.nabble.com/file/n3053430/LSD.jpg Q2: How can i draw the axis secondary scale? Thanks for help. -- View this message in context: http://r.789695.n4.nabble.com/Some-questione-about-plot-tp3053430p3053430.html Sent from the R help mailing list archive at Nabble.com.