Slope of the inner dark matter profile γ_DM at z = 0, comparing CDM haloes (black) to SIDM1 (blue) and vSIDM (green), in the DMO (top) and FP (bottom) runs. We measure the slope of the profile in the radial range 1 kpc≤r ≤ 0.03r_200c, where the latter is chosen based on the Y24 core size distribution from Fig. 4. For low-mass haloes, it may be that this value is too close to the resolution limit, and thus we choose r = 10 kpc as an upper limit. The solid lines show the running medians for each distribution, while the contours represent the 25, 68, and 95 percentiles of the density of points.