#' Plot up a simple polygon
#'
#' @param yr range
#' @param y the function input
#' @return nada
#' @author Ana Parma
#' @examples
#' add.polygon(yrs,q1,q2)
#' @export
#'
add.polygon <- function(yrs,v1,v2,col)
{
polygon(c(yrs,rev(yrs)),c(v1,rev(v2)),col=col,border=NA)
}
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