Hi, qseq is a variable from the data.frame mtcars, that has been used to create the initial plot p.
library(ggplot2) p <- ggplot(mtcars, aes(wt, mpg)) p + geom_point(aes(size = qsec) Just replace qseq by your variable of interest. Regards, Matthieu ______________________________________________ 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.