请问ICC里怎么query local density？

Usage: report_placement_utilization# report_placement_utilization
[-non_fixed_only](Don't include fixed cells to calculate utilization)
[-grid_size float](grid size for one grid)
[-verbose](Display utilization for regions)
[-coordinates {X1 Y1 X2 Y2}]
(for given region)

菜单里面在placement
下面，report placement utilization