title: Add pch symbol in R plot legend
body: <p>I have one time series which is represented by a black line and one which is represented by a red curve. Then I have single points which have the pch symbol of 8 in R. These are stars. See the following plot:
  <img src="https://i.stack.imgur.com/ZhY5D.png" alt="stars"></p>
  
  <p>Currently I have the following legend:</p>
  
  <pre><code>legend("bottomleft", 
   legend=c("log loss","daily VaR","exceedance"),
   bty = "n",lwd=2, cex=1.2,y.intersp=1.4, col=c("black","red","blue"), lty=c(1,1,1))
  </code></pre>
  
  <p>But I don't want to have a blue line in the legend for exceedance, but just the stars in the plot. I have to use the pch=8. I just want to have the stars in the legend, not the stars with a line. So not these solutions: <a href="https://stackoverflow.com/questions/9915527/r-legend-issue-symbols-of-points-are-masked-by-lines">R legend issue, symbols of points are masked by lines</a></p>