title: change limits of secondary y-axis ggplot R
body: <p>I have an issue very similar to this thread <a href="https://stackoverflow.com/questions/41764312/combining-bar-and-line-chart-double-axis-in-ggplot2/41764433#comment83650009_41764433">Combining Bar and Line chart (double axis) in ggplot2</a>.</p>
  
  <p>I followed the answer and everything works perfectly well. However, I have very small proportions (secondary axis) so I want to change the limits of the secondary y-axis. Is there a simple way to do that?</p>
  
  <p>I saw older threads where the answer was to merge the two plots. I was wondering if there may be a new more simpler way to address the limit issue.</p>
  
  <p>Thanks!</p>