title: ggplot2 violin plot: fill central 95% only?
body: <p>ggplot2 can create a very attractive filled violin plot:</p>
  
  <pre><code>ggplot() + geom_violin(data=data.frame(x=1, y=rnorm(10 ^ 5)), 
      aes(x=x, y=y), fill='gray90', color='black') + 
      theme_classic()
  </code></pre>
  
  <p>I'd like to restrict the fill to the central 95% of the distribution if possible, leaving the outline intact.  Does anyone have suggestions on how to accomplish this?</p>