title: How to mark 90 percentile in gnuplot
body: <p>How to mark 90 percentile in gnu plot. sample needed </p>
  
  <pre><code>plot [][] "fle.txt" using 1:2 with lines
  </code></pre>
  
  <p>This is how i plot the graph i want to mark the 90% in the graph
  this is my data set</p>
  
  <pre><code>time(seconds)  frequency  cumulativeFrequency
  10             2          2
  11             6          8
  12             8          16
  13             10         26
  14             7          33
  15             5          38
  16             5          43
  17             4          47
  18             2          49
  </code></pre>