#' @title A4 useable width.
#' @description The width of useable space within an a4 sheet.
#' @return A numeric value.
#' @export
a4_width_mm <- 170
#' @title A4 useable height.
#' @description The height of useable space within an a4 sheet.
#' @return A numeric value.
#' @export
a4_height_mm <- 257
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