Break in Linechart

HTML

<script src="https://code.highcharts.com/highcharts.js"></script>

<div id="container" style="height: 400px; max-width: 800px; margin: 0 auto"></div>

JavaScript

$(function() {
  $('#container').highcharts({
    title: {
      text: 'Zone with dash style'
    },
    subtitle: {
      text: 'Dotted line typically signifies prognosis'
    },
    xAxis: {
      categories: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
    },
    series: [{
      data: [29.9, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6, 148.5, 216.4, 194.1, 95.6, 54.4],
      lineWidth: 0,
      marker: {
        enabled: true,
        radius: 2
      },
      zoneAxis: 'x',
      zones: [
      {
        value: 5
      },
       {
        value: 6,
        color: 'red',
        dashStyle: 'dot'
      }]
    }]
  });
});