title: Plot specified points first then data from file using gnuplot
body: <p>I am trying to plot data from two sources: (1) specific points that define a diagonal from (0, 0) to (1, 1), and (2) file containing my analyzed data. Currently, I can do this using the following command:</p>
  <pre><code>plot [0:1][0:1] 'sample.dat' using 1:2 with lines,\
  '-' title 'random AUC=0.50' with lines dashtype 2
  0 0
  0 0
  0.5 0.5
  1 1
  e
  </code></pre>
  <p>which outputs the following:</p>
  <p><a href="https://i.stack.imgur.com/9SYJD.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/9SYJD.png" alt="sample AUC plot" /></a></p>
  <p>However, I want the diagonal line to appear first. How can I achieve this?</p>