Thanks Jim and Rui. My apologies, i did not give enough info on my plot. I am using : plot(x,y) for a line plot. I want to center the labels on the x-axis for each tick. Thanks. -- View this message in context: http://r.789695.n4.nabble.com/Centering-labels-on-X-axis-tp4646761p4646888.html Sent from the R help mailing list archive at Nabble.com.