You can do it this way, for example: geom_line(linetype="dashed", size=1, colour="blue")
Further info at: http://docs.ggplot2.org/current/geom_line.html -- GG [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.