mlegend(legend_box_x_position = 1.00, legend_display_type = "histogram", legend_label_frequency = 1, legend_box_y_position = 16.00, legend_box_x_length = 27.00, legend_title = "on", legend_text_font_size = 0.50, legend_box_mode = "positional", legend_text_colour = "black", legend_histogram_mean_value = "on", legend_box_y_length = 3.00, legend = "on", legend_title_text = "Temperature at 850 hPa")