title: same scale of Y axis on differents figures
body: <p>I try to plot different data with similar representations but slight different behaviours and different origins on several figures. So the min &amp; max of the Y axis is different between each figure, but the scale too.</p>
  
  <p>e.g. here are some extracts of my batch plotting :</p>
  
  <p><a href="https://i.stack.imgur.com/Syzxw.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Syzxw.png" alt="enter image description here"></a>
  <a href="https://i.stack.imgur.com/hgHw8.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/hgHw8.png" alt="enter image description here"></a></p>
  
  <p>Does it exists a simple way with matplotlib to constraint the same Y step on those different figures, in order to have an easy visual interpretation, while keeping an automatically determined Y min and Y max ?</p>
  
  <p>In others words, I'd like to have the same <em>metric</em> spacing between each Y-tick</p>