code: function () {
  		var point = this;
  		return {
  			x: point.category,
  			y: point.y,
  			key: point.name || point.category,
  			series: point.series,
  			point: point,
  			percentage: point.percentage,
  			total: point.total || point.stackTotal
  		};
  	}
docs: Return the configuration hash needed for the data label and tooltip formatters