Fig. 1.
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Schematic plot of halo groups of different sizes. Halos are grouped and sorted according to the number of particles np in the halo, with increasing size shown from left to right. Every group of halos of the same size, np, is characterized by a halo virial dispersion 
as a function of halo size, while the halo velocity dispersion, 
, is relatively independent of halo size.
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