On 08/27/2013 10:01 PM, mohan.radhakrishnan at polarisft.com wrote: > Hi, > Can't one y-axis be used ? Both 'Kbytes' and 'RSS' use the > same unit. > > Hi Mohan, Yes, you can use a single y axis. What you probably want is something like this: ylim<-range(c(Kbytes,RSS)) plot(rNo,Kbytes,col=2,pch=1,type="b") points(rNo,RSS,col=3,pch=2,type="b") Jim