code: function (path, segment, translatedThreshold) {
  		path.push(
  			L,
  			segment[segment.length - 1].plotX,
  			translatedThreshold,
  			L,
  			segment[0].plotX,
  			translatedThreshold
  		);
  	}
docs: Extendable method to close the segment path of an area. This is overridden in polar
  charts.