Nothing
##This function is stolen from here: http://lamages.blogspot.com/2013/04/how-to-change-alpha-value-of-colours-in.html
##With some slight modifcations.
add.alpha <- function(col, alpha=0.65){
apply(
sapply(col, col2rgb)/255,
2,
function(x){
rgb(x[1], x[2], x[3], alpha=alpha)
}
)
}
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