title: The subscripts are not in times new roman using matplotlib
body: <p>I use matplotlib for plotting and times new roman font. However, in the latest version, <strong>the subscripts are not in Times New Roman</strong>, while the other texts are in Times New Roman. The appearances are as follows.</p>
  
  <p><a href="https://i.stack.imgur.com/xRxGJ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/xRxGJ.png" alt="figure1"></a></p>
  
  <p>For example, the code is as,</p>
  
  <pre><code>import matplotlib as mlp,numpy as np
  mlp.rc('font',family='Times New Roman')
  import matplotlib.pyplot as plt
  fig = plt.figure();
  plt.xlabel('N$_{sou}$=20',fontsize=20)
  plt.show()
  </code></pre>
  
  <p>and the figure is
  <a href="https://i.stack.imgur.com/KqgMs.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/KqgMs.png" alt="figure2"></a></p>
  
  <p>The subscripts "sou" are not in Times New Roman, while "N" is in Times New Roman.</p>
  
  <p>How to solve this problem?</p>