Plotting multi histograms in one. with R : I have a set of data with 5 columns of data. Im looking to put all 5 into a single histagram/ or similar, to compare them. 

    `ggplot()+geom_histogram(data=Ft_max, aes(x=1,2,3,4,5))
does not seem to be having anyt effect and I was hoping to get some advise.