Comparison of the magnitude of convergence, shear, first and second flexion due to a dark matter halo of mass M₂₀₀ = 1 × 10¹²   h^-1   M_⊙, assuming that the mass distribution is described by Einasto, NFW, and SIS profiles and the Sérsic model. The lens and source planes are located at redshifts z_L = 0.4 and z_S = 0.92, respectively. The Einsten radius for the SIS is θ_E = 0.216″, indicating the angular distance when the weak lensing effects are relevant.