title: Python subplot 3 plots in 2x2 matrix (pyramid)
body: <p>i want to plot a subplot as shown in version "a)". 
  If i use <code>plt.subplot2grid</code> and <code>colspan=2</code> i get version "b)" what i don't want.
  Here my current code:</p>
  
  <pre><code>ax1.subplot2grid((2,2), (0,0))
  ax1.plot(m[:,0], m[:,8], color = "0")
  ax2.subplot2grid((2,2), (0,1))
  ax2.plot(m[:,0], m[:,9], color = "0")
  ax3.subplot2grid((2,2), (1,0))
  ax3.plot(m[:,0], m[:,10], color = "0", colespan=2)
  </code></pre>
  
  <p>Thanks in advance!
  <a href="https://i.stack.imgur.com/NmQ1t.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/NmQ1t.png" alt="enter image description here"></a></p>