Thanks Joseph
but see i am not able to get heat maps with this code \ can u please give me the full codes to generate heat map on the same graph where i have drawn contour lines [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.