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library(ggplot2) df <- data.frame(x = c(1,2,1,2), y = c(1,1,2,2), type = c('foo','blah','foo','blah')) ggplot(df, aes(x=x, y=y)) + geom_tile(aes(color = type))
Produces the following image: Rplot.pdf
Where the guide does not indicate the color.
