[SOLVED] Chimney area in the placement_utilization report

Hi all!

Please, tell me, what in "chimney area" in the placement_utilization report from ICC Synopsys? (see report below, bold font)
Thank you!

Std cell utilization: 60.64% (20284/(52600-13721))
(Non-fixed + Fixed)
Std cell utilization: 68.87% (28236/(52600-20141))
(Non-fixed only)
Chip area: 52700 sites, bbox (2.00 2.00 558.88 678.00) um
Std cell area: 29049 sites, (non-fixed:282361 fixed:30488)
3053 cells, (non-fixed:298739 fixed:1914)
Macro cell area: 16720 sites
11 cells
Placement blockages: 163721 sites, (excluding fixed std cells)
20341 sites, (include fixed std cells & chimney area)
0 sites, (complete p/g net blockages)
Routing blockages: 0 sites, (partial p/g net blockages)
0 sites, (routing blockages and signal pre-route)
Lib cell count: 1479

Chimney sites are sites that are smaller than the smallest standard cell in the design.