Physical properties of structures with mean density smaller than 105 cm−3 in simulation Z18 at time 10.04 Myr (as seen with Fig. 2 these structures are not dominated by collapsed objects). Top-left panel: mass-size relation (compared with top-left panel of Fig. 2 which shows the same quantity for all structures). Top-right panel: velocity dispersion (see Eq. (4)) as a function of mass. Typical values are on the order of σ ≃ 0.3 km s−1. Second row: α and αvir . Most cores have values on the order of, or smaller than, a few. Third row: Alfvénic Mach number and the μ parameter.
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