title: NVD3 line chart with vertical line
body: <p>I'm trying to generate a linechart in NVD3 with a vertical line. Particularly <a href="http://nvd3.org/livecode/#codemirrorNav" rel="noreferrer">this kind</a> of line chart.</p>
  
  <p>The linechart has two panels a viewing panel and a zoom panel, I would want the line to be on both. </p>
  
  <p>Something like this:
  <img src="https://i.stack.imgur.com/zla5j.png" alt="enter image description here"></p>
  
  <p>Is this feasible?</p>
  
  <p><strong>Edit:</strong>
  I found out a way to do this by just appending to the data an extra stream which represents a line. e.g.</p>
  
  <pre><code>streams[3] = {key:'myline', values:[{x:68,y:0},{x:68,y:7}]}
  </code></pre>
  
  <p>Is there a better way?</p>