NFW 2D mass isodensity contours of κ_NFW (top), ellipticity as a function of semimajor axis (middle), and the b₄ multipole component as a function of semimajor axis (bottom), in units of NFW scale radius. The NFWp parameterization introduces ellipticity through the lensing potential and is shown in red while the CSE-based NFWm parameterization introduces ellipticity directly in the mass and is shown in gray. The panels from left to right indicate the comparison for three input axis ratios. To match the κ_NFW ellipticities, we use the procedure in Appendix A, which results in the NFWp potential having an input q_ψ as indicated above the top panels.