I want to superimpose histograms from three populations onto the same graph,
changing the shading of the bars for each population.  After consulting the
help files and the archives I cannot find out how to do this (seemly) simple
graph.  To be clear, I want
 
- a single x axis (from -3 to 18)
- three groups of bars forming the histograms of each population (they will
not overlap much, but this is a detail)
- the bars from each histogram having different shadings or other visually
distinguishing features.
 
Can anyone explain how to do this?
 
Thanks.
 

Bill Shipley

 

 

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