code: function () {
  		var chart = this,
  			chartSeries = chart.series;
  
  		// Reset links
  		each(chartSeries, function (series) {
  			series.linkedSeries.length = 0;
  		});
  
  		// Apply new links
  		each(chartSeries, function (series) {
  			var linkedTo = series.options.linkedTo;
  			if (isString(linkedTo)) {
  				if (linkedTo === ':previous') {
  					linkedTo = chart.series[series.index - 1];
  				} else {
  					linkedTo = chart.get(linkedTo);
  				}
  				if (linkedTo) {
  					linkedTo.linkedSeries.push(series);
  					series.linkedParent = linkedTo;
  				}
  			}
  		});
  	}
docs: Link two or more series together. This is done initially from Chart.render,
  and after Chart.addSeries and Series.remove.