minput(input_x_values = [-15.00, 0.00, 15.00],
input_y_values = [50.00, 30.00, 50.00])
mgraph(graph_line_colour = "red",
legend_user_text = " My red curve ",
graph_symbol = "on",
graph_symbol_marker_index = 15,
graph_symbol_colour = "black",
graph_symbol_height = 1.00,
legend = "on",
graph_line_thickness = 8)