Decomposition of the constraining power from time delays (TD), velocity dispersion (VD), and imaging data under the assumption of the ΛCDM model. When only “TD+imaging” is used, the values of D_d and D_Δt are not constrained, and both of them are fully degenerate with λ_int. Since the velocity dispersion constrains the λ_int, the joint constraint (“TD+VD+imaging data”) breaks the degeneracy and hence constrains D_Δt and D_d. The anisotropy parameters are not constrained in all cases.