#' Function to save a ggplot2 graph to disk
#'
#' @param filename A filename as a full path character string, including extensions
#' @export
## save a file in specified folder with ggsave
save_in_image_directory<-function(filename, f.height = 9, f.width = 14, ...){
imageFile <- file.path(image_directory, filename)
ggplot2::ggsave(imageFile, dpi = 900, width = f.width, height = f.height)
}
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