Hello, I plot with filled.contour and have this problem. There is an area that I want to cover with angled shading lines to represent NA in my data. Very much appreciate help. Thanks, Mark pal <- palette(gray(seq(1.,0.,len=8))) filled.contour(fvec,qvec,etsarray, levels=c(-.6,-.4,-.2,,0.,.2,.4,,.6,.8,,1.),zlim=c(-.6,1), xlab=xstring,ylab=ystring, col=pal,key.axes=axis(4,c(-.6,-.4,-.2,0.,.2,.4,.6,.8,1.)))