Slices of the central 2 kpc × 2 kpc DM density field at z = 0 through the location of maximum DM density. From left to right: x– y, x– z, and y– z planes; from top to bottom: Eris, ErisDark, VL2, and GHalo simulations. The position of the slice in the perpendicular direction is given in the top left corner of every panel. The density field has been smoothed with a Gaussian kernel of width σ equal to one gravitational softening length _soft = 124, 124, 40, and 60 pc, respectively. The z-axis coincides with the disk normal in Eris, and with the major axis of the prolate DM density ellipsoid in the other cases. The slice thickness is 10 pc for Eris and ErisDark and 5 pc for VL2 and GHalo. The images are centered on the minimum of the total potential (marked with a white cross), while the location of the maximum density is indicated with a red "x." In the three dissipationless simulations (ErisDark, VL2, and GHalo) the offset between the maximum DM density and the total potential minimum is less than _soft, but it is 2.3 _soft in Eris.