title: plot.lm(): extracting numbers labelled in the diagnostic Q-Q plot
body: <p>For the simple example below, you can see that there are certain points that are identified in the ensuing plots. How can I extract the row numbers identified in these plots, especially the Normal Q-Q plot?</p>
  
  <pre><code>set.seed(2016)
  maya &lt;- data.frame(rnorm(100))
  names(maya)[1] &lt;- "a"
  maya$b &lt;- rnorm(100)
  mara &lt;- lm(b~a, data=maya)
  plot(mara)
  </code></pre>
  
  <p>I tried using str(mara) to see if I could find a list there, but I can't see any of the numbers from the Normal Q-Q plot there.  Thoughts?</p>