title: Multiple histograms in Julia using Plots.jl
body: <p>I am working with a large number of observations and to really get to know it I want to do histograms using Plots.jl
  My question is how I can do multiple histograms in one plot as this would be really handy. I have tried multiple things already, but I am a bit confused with the different plotting sources in julia (plots.jl, pyplot, gadfly,...).</p>
  
  <p>I don't know if it would help for me to post some of my code, as this is a more general question. But I am happy to post it, if needed.</p>