/**
* 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;
}
}
