title: remove italics in latex subscript in matplotlib
body: <p>I would like to remove the italics font that appears when I use subscripts in labels. For example, the "Teff" in the x-label has "eff" in italics. I would like latex not render it in such a way. Generally, in latex this can be achieved with the \rm{} command. However, that does not work in matplotlib. Please help. </p>
  
  <pre><code>import numpy as np
  import matplotlib.pyplot as plt
  
  x = np.arange(10)
  y = x
  
  plt.plot(x,y,'ro')
  plt.xlabel('Primary T$_{eff}$')
  </code></pre>
  
  <p><img src="https://i.stack.imgur.com/ChIue.jpg" alt="enter image description here"></p>