Hello I have x <- c(0.5, 0.7, 3.5, 1.5, 2.5, 2.8) y <- c(0.5, 0.8, 1.5, 3.5, 1.5, 1.5) plot.default(x,y,type="p",panel.first=grid(5,5)) I need to plot that on a grid of 0,1,2,3,4,5 showing the grid lines on the these numbers. how can I do this? e.g how can I contorl the x and y min,max values on the plot and the location of the grid lines? thanks