Average density contrast ΔΣ(r) for the stack S0 (Eq. (5)). The lower panel shows the profile obtained using the radial component of the lensed galaxies’ ellipticity, and should be equals to zero. The upper panel is the profile using the tangential component. Overplotted are the best-fit results (right side of Eq. (9)) for the three mass models, SIS (green-solid line), PLAW (dashed-blue line) and NFW (orange-shaded area, encompassing the combined 1σ uncertainty on M₂₀₀ and c₂₀₀).