import matplotlib.pyplot as plt
import numpy as np

X = np.arange(1, 10)
Y1 = 0.05*X*X
Y2 = 0.03*X*X

plt.ylim(0, 5)
plt.plot(X, Y1, color = 'blue')
plt.plot(X, Y2, color = 'red')
plt.fill_between(X, Y1, Y2, color = 'red', alpha = 0.5)
plt.show()