Physical properties of all structures identified in the simulation Z18 at time 10.04 Myr. Top-left panel: mass versus radius, top-right panel: mean density versus mass. Bottom-left panel: αvir parameter (as stated by Eq. (8)) for all structures while bottom-right panel: αvir only for the structures with a mean density larger than 105 cm−3. The latter confirms that most structures with a mean density larger than 105 cm−3 are collapsed objects since αvir ≃ 1 (with little dispersion).
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