assertEquals(1.4, r.getLowerBound(), EPSILON);
assertEquals(2.5, r.getUpperBound(), EPSILON);
// another empty series
YIntervalSeries s2 = new YIntervalSeries("S2");
dataset.addSeries(s2);
r = DatasetUtilities.iterateRangeBounds(dataset);
assertEquals(1.4, r.getLowerBound(), EPSILON);
assertEquals(2.5, r.getUpperBound(), EPSILON);
// an item in series 2