import numpy as np
import matplotlib.pyplot as plt

a = np.arange(3)
np.random.seed(1)
b = a + np.random.randn(3)

plt.plot(a, b, linestyle='--')
plt.plot(a, a+b, linestyle='-')
plt.xlabel('x')
plt.ylabel("y")
plt.legend(shadow=True)
plt.title('Shadow')
