แถบความเชื่อมั่น 90 และ 95%

int_widths = ['90%', '99%']
z_scores = [1.67, 2.58]
colors = ['#fc8d59', '#fee08b']

for percent, Z, color in zip(int_widths, z_scores, colors):
    
    # Pass lower and upper confidence bounds and lower opacity
    plt.fill_between(
        x = cinci_13_no2.day, alpha = ____, color = color,
        y1 = cinci_13_no2['mean'] ____ ____*cinci_13_no2['std_err'],
        y2 = cinci_13_no2['mean'] ____ ____*cinci_13_no2['std_err'],
        label = percent)
    
plt.legend()
plt.show()