title: Why is the title on the middle of figure? How can I make it on the top?
body: <p>The figure shows the title on the middle of the figure, like that:</p>
  <p><a href="https://i.stack.imgur.com/4yNPn.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/4yNPn.png" alt="enter image description here" /></a></p>
  <pre><code>x=[2, 3, 4, 5, 6]
  
  y1=[186.1514196056709, 159.12401454010774, 168.58499675415746, 175.84505835379582, 176.46936542235537]
  
  y2=[0.3016510699429101, 0.26247594932831353, 0.29913169309436605, 0.3053190632425873, 0.3186662404748315]
  
  y3= [1.2213442807894994, 1.2553757513887367, 1.1182748303246677, 1.003606425268881, 0.9987302918527493]
  
  fig,(l1,l2,l3) = plt.subplots(3, 1, sharex=True)
  l1.plot(x,y1,'ro-',label='Calinski-Harabasz')
  l2.plot(x,y2,'b^-',label='the Davies-Bouldin')
  l3.plot(x,y3,'g+-',label='Silhouette Coefficient ')
  
  l1.set_ylim(140, 200)
  l2.set_ylim(0.8, 1.4)
  l3.set_ylim(0.2, 0.4)
  
  l1.spines['bottom'].set_visible(False)
  l2.spines['top'].set_visible(False)
  l2.spines['bottom'].set_visible(False)
  l3.spines['top'].set_visible(False)
  l1.xaxis.tick_top()
  l2.xaxis.tick_bottom()
  l3.xaxis.tick_bottom()
  
  
  plt.title('The Scores in K-means Conditions',loc='center')
  plt.xlabel('clusters number')
  plt.ylabel('scores')
  plt.show()
  </code></pre>