![\begin{figure}
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Figure 1:
3D radial phase space plots (radial velocity versus radial distance,
both relative to the halo center and normalized to the virial circular velocity
and radius, respectively) of dark matter particles in a CDM
cosmological N-body simulation for the four most massive halos at redshift
z=0. The virial radius, mass and circular velocity at virial radius are
listed on the right corner of each plot. The open and small
closed circles are the identified halos in the cosmological simulation
respectively without and with galaxies within them.
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