docs: function (userOptions) {
  		
  		var options = this.options = merge(
  			this.defaultOptions,
  			this.defaultRadialOptions,
  			userOptions
  		);
  
  		// Make sure the plotBands array is instanciated for each Axis (#2649)
  		if (!options.plotBands) {
  			options.plotBands = [];
  		}
  		
  	}