import matplotlib.pyplot as plt
import numpy as np
import scipy.stats as st
import arviz as az
plt.style.use('arviz-darkgrid')
x = np.linspace(-5, 5, 1000)
mus = [0., 0., 0., -2.]
sigmas = [0.4, 1., 2., 0.4]
for mu, sigma in zip(mus, sigmas):
    pdf = st.norm.pdf(x, mu, sigma)
    plt.plot(x, pdf, label=r'$\mu$ = {}, $\sigma$ = {}'.format(mu, sigma))
plt.xlabel('x', fontsize=12)
plt.ylabel('f(x)', fontsize=12)
plt.legend(loc=1)
plt.show()