title: Google Visualisation Line Chart - Multiple Lines
body: <p>I have a line chart, h-axis is date, v-axis is double.
  I need to display two lines:</p>
  
  <pre><code>lineA: [
      [2016-1-1 00:00, 1.1]
      [2016-2-1 00:00, 1.1]
      [2016-3-1 00:00, 1.1]
  ]
  lineB: [
      [2016-1-1 00:00, 2.1]
      [2016-2-1 08:00, 2.1]
      [2016-3-1 00:00, 2.1]
  ]
  </code></pre>
  
  <p>To display the data on the chart, I need to combine these two lines and pass the result to arrayToDataTable.</p>
  
  <pre><code>combine: [
      [2016-1-1 00:00, 1.1, 2.1],
      [2016-2-1 00:00, 1.1, null],
      [2016-2-1 08:00, null, 2.1],
      [2016-3-1 00:00, 1.1, 2.1],
  ]
  </code></pre>
  
  <p>As a result of the above, I am getting gaps on the lines. How can I solve this issue? Is it possible to pass two individual sets, one for each line? All the examples I have found require them to be merged as the <code>combine</code> table.</p>
  
  <blockquote>
    <p>I need to keep the nulls when provided as part of line1 and line2
    table</p>
  </blockquote>