title: How do I match up the grid lines for a secondary y-axis in core plot?
body: <p>I've set up a core plot graph with two plot spaces - one for a set of bar charts, with its y-axis on the left, and one for a scatter plot with its y-axis on the right.  It works, except that the grid lines don't match up:</p>
  
  <p><img src="https://i.stack.imgur.com/8jR9h.png" alt="enter image description here"></p>
  
  <p>Both axes have their labeling policy set to <code>CPTAxisLabelingPolicyAutomatic</code>.  Is there a way to change the axes so that the grid lines match up?</p>