I've been using qplot pretty successfully to generate stacked histograms.  However, it appears that I need to tweak the colors a little.  
 
I've got three temperature variables (characters not numeric) and I need to change from the default qplot colors to the following:
Low = Blue
Middle = black
High = Red
 
Here is pseudo code of what I have currently:qplot(Run, data = TestData, breaks = hist_breaks, ,  
          fill = TestData$Temperature, 
          main = short_title) +
          scale_x_continuous("Run, Radians") + scale_y_continuous("Frequency") + 
          scale_fill_discrete("Temperature")
 
Thanks for any advice and insights.
 
 


      
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