Dọn dải bất định khi bị chồng lấp

for city, color in [('Denver',"#66c2a5"), ('Long Beach', "#fc8d62")]:
    # Filter data to desired city
    city_data = SO2_compare[SO2_compare.____  ==  ____]

    # Set city interval color to desired and lower opacity
    plt.fill_between(x = 'day', y1 = 'lower', y2 = 'upper', data = city_data,
                     color = ____, alpha = ____)
    
    # Draw a faint mean line for reference and give a label for legend
    plt.plot('day','mean', data = city_data, ____ = city,
             color = ____, alpha = ____)

plt.legend()
plt.show()