code: function () {
  		var series = this,
  			yAxis = series.yAxis;
  
  		seriesTypes.area.prototype.translate.apply(series);
  
  		// Set plotLow and plotHigh
  		each(series.points, function (point) {
  
  			var low = point.low,
  				high = point.high,
  				plotY = point.plotY;
  
  			if (high === null && low === null) {
  				point.y = null;
  			} else if (low === null) {
  				point.plotLow = point.plotY = null;
  				point.plotHigh = yAxis.translate(high, 0, 1, 0, 1);
  			} else if (high === null) {
  				point.plotLow = plotY;
  				point.plotHigh = null;
  			} else {
  				point.plotLow = plotY;
  				point.plotHigh = yAxis.translate(high, 0, 1, 0, 1);
  			}
  		});
  
  		// Postprocess plotHigh
  		if (this.chart.polar) {
  			each(this.points, function (point) {
  				series.highToXY(point);
  			});
  		}
  	}
docs: Translate data points from raw values x and y to plotX and plotY