YIntervalSeriesCollection d1 = new YIntervalSeriesCollection();
YIntervalSeries s1 = new YIntervalSeries("S1");
s1.add(1.0, 1.1, 1.2, 1.3);
YIntervalSeries s2 = new YIntervalSeries("S2");
s2.add(1.0, 1.1, 1.2, 1.3);
d1.addSeries(s1);
d1.addSeries(s2);
YIntervalSeriesCollection d2 = new YIntervalSeriesCollection();
YIntervalSeries s3 = new YIntervalSeries("S3");
s3.add(1.0, 1.1, 1.2, 1.3);