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Fig. 9

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Scaling relation between σv2/R$\[\sigma_v^2 / R\]$ and surface mass density (Σ). The symbols and notations follow Fig. 8. The solid grey lines represent isocontours of virial parameters. The dashed lines represent αvir = 1 when including an external pressure of Pext = 1, 10, and 100 M pc−3 km2 s−2.

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