public void setRangeAxis(int index, ValueAxis axis) {
        setRangeAxis(index, axis, true);
    }

    /**
     * Sets a range axis and, if requested, sends a {@link PlotChangeEvent} to
     * all registered listeners.
     *
     * @param index  the axis index.
     * @param axis  the axis.
     * @param notify  notify listeners?
     */
    public void setRangeAxis(int index, ValueAxis axis, boolean notify) {
        ValueAxis existing = (ValueAxis) this.rangeAxes.get(index);
        if (existing != null) {
            existing.removeChangeListener(this);
        }
        if (axis != null) {
            axis.setPlot(this);
        }
        this.rangeAxes.set(index, axis);
        if (axis != null) {
            axis.configure();
            axis.addChangeListener(this);
        }
        if (notify) {
            fireChangeEvent();
        }
    }

    /**
     * Sets the range axes for this plot and sends a {@link PlotChangeEvent}
     * to all registered listeners.
     *
     * @param axes  the axes (<code>null</code> not permitted).
     *
     * @see #setDomainAxes(CategoryAxis[])
     */
    public void setRangeAxes(ValueAxis[] axes) {
        for (int i = 0; i < axes.length; i++) {
            setRangeAxis(i, axes[i], false);
        }
        fireChangeEvent();