Overlay histogram with density curve

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Here you go!

# create some data to work with
x = rnorm(1000);

# overlay histogram, empirical density and normal density
p0 = qplot(x, geom = 'blank') +   
  geom_line(aes(y = ..density.., colour="Empirical"), stat="density") +  
  stat_function(fun = dnorm, aes(colour="Normal")) +                       
  geom_histogram(aes(y = ..density..), alpha = 0.4) +                        
  scale_colour_manual(name="Density", values = c('red', 'blue')) + 
  theme(legend.position = c(0.85, 0.85))

print(p0)

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