code: function (cb, context) {
          assertSeriesInitialized(this);
          each(this._seriesIndices, function (rawSeriesIndex) {
              var series = this._componentsMap.get('series')[rawSeriesIndex];
              cb.call(context, series, rawSeriesIndex);
          }, this);
      }
docs: After filtering, series may be different
  frome raw series.
  
  @param {Function} cb
  @param {*} context