Color values for an XYZRenderer.(x, y, z) data item, which can be added to
a XYZSeries.XYZDataset.(x, y, z) data items.XYZDataset.XYZDataset.XYZDataset.XYZDataset on an
XYZPlot.(x, y, z) data items.XYZSeries objects (implements the XYZDataset
interface so that it can be used as a source of data for an
XYZRenderer on an XYZPlot).XYZSeriesCollection instance.