mgrib(grib_id = "z500",
grib_input_file_name = "z500.grb")
mcont(contour_level_selection_type = "interval",
contour_label_colour = "navy",
contour_line_colour = "evergreen",
contour_label_height = 0.50,
contour_line_thickness = 2,
contour_label = "on",
contour_highlight_frequency = 5,
contour_highlight_colour = "navy",
contour_highlight_thickness = 2,
legend = "off",
contour_interval = 4.00,
contour_line_style = "dash")