title: Why subscripts are missing in the labels?
body: <p>I want to display the subscript in the labels in the bar plot. Labels are the keys from the dictionary data in the following. I know how to use latex to do so, but I need to display it as it is from the keys in the dictionary. When I use the following script, it just displays the empty box, instead of the subscript.
  <a href="https://i.stack.imgur.com/K3jA0.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/K3jA0.png" alt="enter image description here" /></a></p>
  <pre><code>import numpy as np
  
  data = {'CO₆': 15,
   'DO₄': 144,
   'EO₈': 3,
   'FaO₉': 1,
   'GO₅': 7,
   'Ha₆': 5}
  
  f, ax = plt.subplots(figsize = (40, 4))
  
  bin = np.arange(len(data.keys()))
  
  ax.bar(data.keys(), data.values(), color='brown', align = &quot;center&quot;, width = 0.3);
  
  plt.xticks(rotation='vertical');
  
  ax.xaxis.set_tick_params(labelsize = 32);
  
  ax.yaxis.set_tick_params(labelsize = 32);
  
  plt.xlim(-0.5, bin.size-0.5);
  </code></pre>