 			_columns = Arrays.copy(cols);
 			_peaks = new Array(cols.length);
 			_poly = new Array(cols.length);
+			_colScale = getScale(_columns);
 		}
 		
 		/** Flag indicating if the visualization should be normalized. */		

				case Stats.OBJECT:
				default:
					return new OrdinalScale(stats.distinctValues, true, false);
			}
		}
		

		private var _threshold:Number = 1.0;
		
		private var _scale:QuantitativeScale = new LinearScale(0,0,10,true);
		private var _colScale:Scale;
		
		/** Array containing the column names. */
		public function get columns():Array { return _columns; }
