public int getSeriesCount() {
            return this.delegateSet.getSeriesCount();
        }

        /**
         * Returns the name of the given series.
         * 
         * @param series  the series index (zero-based).
         * 
         * @return The series name.
         */
        public Comparable getSeriesKey(int series) {
            return this.delegateSet.getSeriesKey(series);