#' @title FUNCTION_TITLE
#' @description FUNCTION_DESCRIPTION
#' @param x1 PARAM_DESCRIPTION
#' @param y1 PARAM_DESCRIPTION
#' @param x2 PARAM_DESCRIPTION
#' @param y2 PARAM_DESCRIPTION
#' @param color PARAM_DESCRIPTION, Default: col.shade
#' @return OUTPUT_DESCRIPTION
#' @details DETAILS
#' @examples
#' \dontrun{
#' if(interactive()){
#' #EXAMPLE1
#' }
#' }
#' @rdname shade
#' @export
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