>>820

dat <- with(density(rnorm(100)),data.frame(x,y))

library(ggplot2)

ggplot(data = dat, mapping = aes(x = x, y = y)) +
geom_line() +
layer(data = dat, mapping = aes(x=ifelse(x >1 & x < 2 ,x,0), y=y), geom = "area", geom_params=list(fill="red",alpha=0.5)) +
scale_y_continuous(limits = c(0,max(dat$y)))