Bug report

Marker 'x' too big

• The marker 'x' is bigger than the other makers '+', 'o', '1', etc.

Code for reproduction

#!/usr/bin/env python                                                          

import numpy as np
import matplotlib.pyplot as plt

x = [1, 2, 3]

x = (1, 2, 3)

plt.plot((1, 2, 2, 3), (1.5, 1, 1, 2), 'o', fillstyle='none')
plt.plot(x, (1, 2, 2), '+')
plt.plot(x, (2, 1, 1), 'x')

plt.savefig('test.png')

Actual outcome

• X markers are too big.
  See images attached

Expected outcome

All markers should have the same size.

Matplotlib version

• Matplotlib version 2.0.0, Python 2.7.13 and Debian 9.
• Matplotlib installed with pip