title: Matplotlib, override Y position with pixel position
body: <p>I am trying to plot the following charts with Matpltlib:
  <a href="https://i.stack.imgur.com/bWraK.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/bWraK.png" alt="enter image description here"></a></p>
  
  <p>I would like to have the colored dots at a constant distance from the bottom of the charts.
  However as you can see they jump all over the place as their y coordinate is given in y value, and the y axis is different in each chart. Is there a way to define their y position in pixels from the x axis? Without having to resort to % of (top of the chart - bottom of the chart) would be ideal. Thanks!</p>