code: function (itemOptions) {
  		var chart = this.chart,
  			chartOptions = chart.options,
  			plotOptions = chartOptions.plotOptions,
  			typeOptions = plotOptions[this.type],
  			options;
  
  		this.userOptions = itemOptions;
  
  		options = merge(
  			typeOptions,
  			plotOptions.series,
  			itemOptions
  		);
  		
  		// the tooltip options are merged between global and series specific options
  		this.tooltipOptions = merge(chartOptions.tooltip, options.tooltip);
  		
  		// Delte marker object if not allowed (#1125)
  		if (typeOptions.marker === null) {
  			delete options.marker;
  		}
  		
  		return options;
  
  	}
docs: Set the series options by merging from the options tree
  @param {Object} itemOptions