Hi, kindly give me some guide on how to plot the following data in a single line graph that is ( y1,y2,y3,y4 against x) including title and key y1<-c(0.84,1.03,0.96) y2<-c(1.30,1.46,1.48) y3<-c(1.32,1.47,1.5) y4<-c(0.07,0.07,0.07) x<-c(500,1000,2000) Thanks Ishaq [[alternative HTML version deleted]]