code: function(json, facet, options) {	
  	var related_facet = (options && options.related_facet) || 'related_facet'
  	, series_list = _.plain(json).sortPlain(facet || 'parent').keys().value()
  	, series = [ related_facet];
  	
  	facet = facet || this.getParent( json );
  	
  	// map over the object to aggregate row values
  	return({
  		values: _mapSeries( _.reduce(json, function(res, hash, key) {
  			res[key] = _formatRow(null, hash, related_facet);
  			return res;
  		}, {}), _.keys(json), series ),
  		facet: facet,
  		series: series,
  		series_list: series_list,
  		series_length: series_list.length,
  		depth: depth(json)
  	});
  }
docs: /*
  { parent: 'category.Neoplasms',	// column
  facet: 'Adenoma, Islet Cell', // row
  related_facet: 1 }	// cell value