Hello, I am learning how to use R, and I cannot figure out how to plot more than one data set on a single plot. Can you help me out? Cheers, Mark -- Mark Sessing CIMMS Research Fellow Meteorologist NWS Warning Decision Training Branch 3200 Marshall Ave Ste. 202 Norman, OK 73072 Phone: 405-573-3332 Fax: 405-573-3462 Mark.L.Sessing at noaa.gov