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...nd ylim. I have even modified the qq.plot.R source and re-compiled but none of these efforts has given any result. I am doing a sequence of steps like the following: library(car) p<-read.csv("inputP",header=T) p <- apply(p,c(1,2),as.numeric) q<-qchisq(1-p,2) png(file="outputP.png", bg="transparent") plot.window(xlim=c(0,50), ylim=c(0,50)) qq.plot(q, dist="chisq", df=2) y<-rchisq(length(p),2) lines(y,y) dev.off() Is there anything that I can do to produce several q-q plots from different data and put them in the same scale, say x-values i...