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The axis values are -6,-4,-2,0,2,4,6 with some y values in a density plot. Is it possible to add dotted vertical lines on certain x-axis values (Forex: -3 and +3 )using ggplot? library(ggplot2) df <- data.frame(x = rnorm(1000, 0, 1), y = rnorm(1000, 0, 2), z = rnorm(1000, 2, 1.5)) df.m <- melt(df) ggplot(df.m) + geom_freqpoly(aes(x = value, y = ..density.., colour = variable))
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