A plot similar to the one shown here will appear when the user selects the ‘PDF’ radio button. The data for the site selected in the site drop-box are plotted as a histogram. In addition, the PDF’s of all selected distributions are plotted as curves of various colors. There are 13 standard distributions included within the current version of Hydro-FIT. The user can plot or remove any of the distributions on the PDF graph by clicking the checkbox(es) adjacent to the desired distribution(s). The image shown here demonstrates the PDF graph using Palmer Drought Index data over a region in northern Argentina.