R-users it appears I am leaning on your knowledge once again.  Is there any way to add a vertical line to a histogram and qplot "stacked" plot?  Here is my current attempt:
 
"qplot" approach attempt:
qplot(Run, data = data_dataframe, breaks = breaks, fill = Temperature, main = short_title) + scale_x_continuous("Data") + scale_y_continuous("Freq") +  scale_fill_discrete("Temperature") + scale_fill_manual(values = c(LOW = "blue", AMB ="black", HIGH = "red")) +  geom_abline(v = HighVal, col = "dodgerblue3", lty="dotdash") 
 
 
"hist" approach attempt:
hist(data_dataframe, breaks = breaks,  col = "dodgerblue3", xlab="Data", freq = TRUE, main="") +abline(v = HighVal, col = "dodgerblue3", lty="dotdash")   
 
Neither seem to be working.  I think I am missing something small to get this to work.  
 
Thank you again for any feedback you can provide. 


      
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