/** * Return the range of z-values in the specified dataset. * * @param dataset the dataset (<code>null</code> permitted). * @return The range (<code>null</code> if the dataset is <code>null</code> or empty). */ public Range findZBounds(XYZDataset dataset) { if (dataset != null) { return DatasetUtilities.findZBounds(dataset); } else { return null; } }