mgrib(grib_field_position = 1, grib_input_file_name = "period_of_swell.grib") mcont(contour_shade_colour_method = "list", contour_label_colour = "black", contour_line_colour = "white", contour_reference_level = 0.00, contour_label_format = "(F4.1)", contour_label = "off", contour_min_level = 0.00, contour_shade_method = "area_fill", legend = "on", contour_shade_colour_list = ["blue", "greenish_blue",...,"brown", "charcoal"], contour_level_selection_type = "level_list", contour_shade = "on", contour_level_list = [0.00, 3.50,...,17.00, 18.50], contour_hilo = "off", contour_highlight = "off", contour_shade_min_level = 0.00)