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Returns the current explicit grouping option.
Call this method to retrieve the current explicit grouping option. The "explicit grouping" forces a 3D chart to show series on Z axis as grouped (maximum Z coordinate is always 1) or non-grouped (Z coordinate is set to the number of series, e.g. each series has its own Z coordinate). For example, stacked charts are always grouped, but a "Manhattan stacked chart" should be displayed as ungroupped.