old_contents: Rickshaw.namespace('Rickshaw.Graph.Renderer.Stack');
  
  Rickshaw.Graph.Renderer.Stack = Rickshaw.Class.create( Rickshaw.Graph.Renderer, {
  
  	name: 'line',
  
  	defaults: function($super) {
  
  		return Rickshaw.extend( $super(), {
  			fill: true,
  			stroke: false,
  			unstack: false,
  		} );
  	},
  
  	seriesPathFactory: function() {
  
  		var graph = this.graph;
  
  		return d3.svg.area()
  			.x( function(d) { return graph.x(d.x) } )
  			.y0( function(d) { return graph.y(d.y0) } )
  			.y1( function(d) { return graph.y(d.y + d.y0) } )
  			.interpolate(this.graph.interpolation).tension(this.tension);
  	}
  } );
  
  
new_contents: Rickshaw.namespace('Rickshaw.Graph.Renderer.Stack');
  
  Rickshaw.Graph.Renderer.Stack = Rickshaw.Class.create( Rickshaw.Graph.Renderer, {
  
  	name: 'stack',
  
  	defaults: function($super) {
  
  		return Rickshaw.extend( $super(), {
  			fill: true,
  			stroke: false,
  			unstack: false,
  		} );
  	},
  
  	seriesPathFactory: function() {
  
  		var graph = this.graph;
  
  		return d3.svg.area()
  			.x( function(d) { return graph.x(d.x) } )
  			.y0( function(d) { return graph.y(d.y0) } )
  			.y1( function(d) { return graph.y(d.y + d.y0) } )
  			.interpolate(this.graph.interpolation).tension(this.tension);
  	}
  } );
  
  
subject: fix typo