title: Python - Organisation of 3 subplots with matplotlib
body: <p>I try to generate 3 subplots for my figure. It seems work but it is not perfectly aligned. How to have the same width between the figure at the bottom et the figures at below?</p>
  
  <pre><code>plt.close()
  fig = plt.figure()
  
  ax1 = plt.subplot(211)
  ax1.plot(cycles,np.asarray(df_int),'wo',label='')
  ax1.plot(cycles,np.asarray(df_proj),'k+',label='')
  ax1.legend(loc=2)
  #ax1.subplots_adjust(left=0.15)
  ax1.set_ylim(0.001,0.004)
  
  ax2 = plt.subplot(223)
  i2=ax2.imshow(c,cmap=plt.cm.hot, vmin=-5, vmax=5);#plt.colorbar();plt.clim(-5,5)
  cb2=plt.colorbar(i2,ax=ax2,ticks=[-5,0,5],fraction=0.046, pad=0.04,format='%.2f')
  cb2.ax.tick_params(labelsize=12)
  
  
  
  ax3 = plt.subplot(224)
  i3=ax3.imshow(residue_proj,cmap=plt.cm.hot, vmin=-5, vmax=5);#plt.colorbar();plt.clim(-5,5);
  cb3=plt.colorbar(i3,ax=ax3,ticks=[-5,0,5],fraction=0.046, pad=0.04,format='%.2f')
  cb3.ax.tick_params(labelsize=12)
  
  plt.savefig('test.png', dpi=500,  bbox_inches='tight', pad_inches=0.1)
  #plt.show()
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/ESZos.png" rel="noreferrer"><img src="https://i.stack.imgur.com/ESZos.png" alt="enter image description here"></a></p>