#' @param file_out A character value specifying a file name to write
#' output to. If the function takes the argument \code{dir}, then
#' the file will be written to \code{file.path(dir, file_out)}. If the
#' argument \code{dir} is not included in the function then the file will
#' be written to the current directory or one can specify a full path name.
#' The default will depend on the function and if \code{is.null(file_out)}
#' then no file will be written.
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