#'Add transparency to a color
#'
#'@param col a vector of colors
#'@param alpha the level of transparency
#'@return the vector of transparent colors
#'@export
add.alpha <- function(col, alpha = 1) {
apply(sapply(col, col2rgb)/255, 2, function(x) rgb(x[1],
x[2], x[3], alpha = alpha))
}
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