graphics - R histogram with multiple populations -

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I am interested in creating a histogram in R, in which two (or more) populations will be at the top of each other, which means - I do not want a two histogram that shares a similar graph, but once there are two colors or more.

Below the picture found - this is what I want to accomplish.

Any ideas? This is actually the annoying default in ggplot2:

pre> Library (GG Plot 2) Gigplot (Iris, AES (X = SepelLange, Phil = Species)) + GOM_Histogram ()


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