Comparison of radial density profiles for the region of collapsing material (left) and the region of outflowing material (right). For both sides, the top panel is the density profile and the bottom panel is the gradient. The solid black profile is the DM, the dashed coloured profile (blue for collapsing material and orange for outflowing material) is the gas, and its dotted dark counterpart is the sum of DM and gas. Vertical dashed lines are R_200m (grey), R_sp from gas (coloured), and DM (dark coloured). In each region, we observe that R_sp,DM <  R_sp,gas. We also note that R_sp is smaller for both DM and gas in the region of collapsing material compared to the region of outflowing material.