Highlight data individually with facet_grid in R

Question

I am using facet_grid in R to plot RT data for 5 different groups. I would like to highlight the data between 5 and 95% for each group.

With the code below, I am usi

Answer 1

Thanks to DWin's suggestion, I used ave to find xmin and xmax for each group individually and incorporated that directly into the command for the plot.

There is probably a more elegant way to do that (and suggestions are welcome), but it works.

qplot(prevRT, RT, group=ss, color = prim, 
 geom = c("smooth"), 
 method="lm", data =ss) + 
 facet_grid(~ Groupe) + 
 geom_rect(data=ss, 
      aes(xmin=ave(ss$RT, ss$Groupe, FUN = function(x)quantile(x,c(0.05))),      
      xmax=ave(ss$RT, ss$Groupe, FUN = function(x)quantile(x,c(0.95))),
      ymin=-Inf,ymax=Inf), color="green", alpha=1/280, inherit.aes = FALSE)