title: Highcharts - navigation by 3rd element in series 'hidden' in plot
body: <p>I have some info which is in this format (speed, frequency, date). What happens is that I need to plot this chart with speed x frequency, but I want to allow the users to use the navigation filtering by the date, which is not appearing on the chart.</p>
  
  <p>Also, I have some info which is not built dynamically, which is the limits of speed x frequency. This info will be fixed as reference points on the plot. So, when I filter the plot info (not the limits), it must always display these limit plots.</p>
  
  <p>You can have an idea by this chart, the area plots show the limits for the points (speed, frequency). Then, I would add points of speed x frequency (x date), and filter then by date.
  <a href="https://i.stack.imgur.com/t4PJw.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/t4PJw.png" alt="Chart speed frequency"></a></p>
  
  <p>Can you guys give me some advice on this?</p>
  
  <p>here is a JSFIDDLE </p>
  
  <p><a href="https://jsfiddle.net/3wuwdonn/" rel="nofollow noreferrer">JSFIDDLE</a></p>
  
  <pre><code>data: [
                  [0, 20, here is a date], [10, 20,here is a date],
                  [50, 39.9994, here is a date], [100,49.7494, here is a date]
              ],
  </code></pre>
  
  <p>Guys, notice that every element of the array in the series has 3 elements [a, b, c], suppose the third one (c) is a DATE and not a random number as it is right now. I want to be able to use the commented the navigator code to filter this series by this C element, which doesn't in fact appear on the chart you see, it is a hidden element, just to filter the data.</p>