Hi robert, It's not a typo, i have the book and the right code is : huron <- data.frame(year=1875:1972,level=LakeHuron) p <- ggplot(huron, aes(year)) + geom_line(aes(y= level - 5, colour = 'blue')) + geom_line(aes(y= level + 5, colour = 'red')) print(p) So colour must inside aes....
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