'2040': {
    '0000': ['UL', '1', 'GenericGroupLength'],
    '0010': ['SQ', '1', 'ReferencedOverlayPlaneSequence'],
    '0011': ['US', '1-99', 'ReferencedOverlayPlaneGroups'],
    '0020': ['SQ', '1', 'OverlayPixelDataSequence'],