title: Highcharts: how to use multiple line formats in one series?
body: <p>I would like to use multiple line formats in a line chart with a single data series, e.g. like this:
  <img src="https://i.stack.imgur.com/93EQq.png" alt="enter image description here"></p>
  
  <p>I've created this example by concatenating two separate series, but I'd rather not use this workaround.</p>
  
  <p>Does anyone know how to do this with Highcharts?</p>