wuResult_.significance;
    },

    get viewState() {
      return this.viewState_;
    },

    get row() {
      return this.row_;
    },

    get histogram() {
      return this.histogram_;
    },

    get referenceHistogram() {
      const referenceDisplayLabel =
        this.row.rootViewState.referenceDisplayLabel;
      if (!referenceDisplayLabel) return undefined;
      if (referenceDisplayLabel === this.displayLabel_) return undefined;
      return this.row.columns.get(referenceDisplayLabel);
    },
