Comparison between the 3D and 2D densities using Z = 1 and Z = (pq)^1/3, under axial symmetry and MGE formalism. Left: 3D density of a NFW profile with different intrinsic axis ratios. The oblate profile has an intrinsic axis ratio of 0.5, and the prolate profile has an intrinsic axis ratio of 1.6. The solid lines are the sphericalized (averaged on a sphere) density profiles. The dashed lines are the 3D density profiles along the symmetry axis of axisymmetric profiles. Right: Stacked surface density obtained by projecting the 3D densities on the left column 1000 times.