title: bring line plot to front of bar plot
body: <p>I have a line and a bar plots in the same graph. However, the bar plot is in the front of the line plot. How can I send the line plot to the front?</p>
  
  <pre><code>h&lt;-hist(loose_All, breaks="FD", plot=FALSE)
  xfit&lt;-seq(min(loose_All),max(loose_All),length=100)
  x.norm&lt;-rnorm(n=100000, mean=mapply("[", results[1], 1),
           sd=mapply("[", results[1], 2))
  yfit&lt;-dnorm(xfit,mean=mean(x.norm),sd=sd(x.norm))
  yfit &lt;- yfit*max(h$counts)/max(yfit)
  plot(xfit*1.1, yfit*1.1, col="blue", lwd=2, type="l", xlab="Looseness",
   main="Normal pdf and histogram",)
  plot(h, add=TRUE, col="grey",freq=TRUE)
  </code></pre>
  
  <p>Thanks</p>