title: R: positioning of the legend and length of the lines in the legend
body: <p>I can't set the location of the legend properly, I have tried to play around with <code>xjust</code> and <code>ncol</code> but it still appears in the middle of the graphic. </p>
  
  <p>Can you help it align it to the border (left or right I do not care)?</p>
  
  <p>Moreover is it possible to draw shorter lines in the legend? These appear too long.</p>
  
  <pre><code> par(mar=c(5,4,4,5)+.1)
   plot(1:109,rnorm(109), type="l",col="blue", lwd=2, 
        main="Compare signal and std deviation MC3 ch44",
        ylab="signal", xlab="locations")
   par(new=TRUE)
   plot(1:109, rnorm(109), ylab="",xlab="", type="l", 
        col="red",xaxt="n",yaxt="n", lwd=2)
   axis(4)
   mtext("std. deviation",side=4,line=3)
   legend("topright",col=c("blue", "red"), lwd=2,
          legend=c("signal","std dev"), cex=0.85, bty="n", xjust=1)
  </code></pre>