#' @param export `export = "no"`, does nothing, so the next graph uses the
#' default R device. With this option, the size of the graph cannot have been
#' set larger than the default size, which is usually 7 inches. `export =
#' "unix"`, a new graphics window in unix, size `h` and width `w`, will be
#' opened allowing you to alter the size of the output. `export = "windows"`,
#' or `export = "mac"` are similar to `export = "unix"` but for windows and
#' mac. `export = format` exports the graph to a specific file format: "pdf",
#' "png", "jpg", "bmp", "emf".
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