Top: Density profile of halo d at early (﹩z=1.72﹩, dashed line) and late (﹩z=0﹩, solid line) times. The former is offset by 1 dex. Arrows indicate the NFW scale length r_s. Bottom: Concentration parameter of the NFW fit to density profiles for the halos as they evolve in time. The solid line represents halo b, the dashed line represents halo d, and the dotted line represents halo e.