public void zoomRangeAxes(double x, double y, double factor) {
        // TODO: to be implemented
    }

    /**
     * Zooms the range axes (not yet implemented).
     * 
     * @param x  the x-coordinate (in Java2D space).
     * @param y  the y-coordinate (in Java2D space).
     * @param lowerPercent  the new lower bound.
     * @param upperPercent  the new upper bound.
     */
    public void zoomRangeAxes(double x, double y, double lowerPercent, 
                              double upperPercent) {