Sometimes you may want to ensure limits include a single value, for all
panels or all plots. This function is a thin wrapper around
geom_blank that makes it easy to add such values.
named list of aesthetics specifying the value (or values) that should be included in each scale.
p + expand_limits(y = c(1, 9))p + expand_limits(x = 0, y = 0)ggplot(mtcars, aes(mpg, wt)) + geom_point(aes(colour = cyl)) + expand_limits(colour = seq(2, 10, by = 2))