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Fig. 19.

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Fermat potential differences Δϕ = Δϕmodel(1 − κext) from LENSTRONOMY for the power-law (red) and composite (blue) model with the kinematics information folded into these individual model posteriors. The folding in of the kinematics information is performed through importance sampling from the posterior weighted by the kinematics likelihood (Eq. (41)). Next, the two model posteriors are joined together with equal weights and then the kinematics information is folded in. The combined posterior (purple) mostly resemble the power-law posterior, as the composite posterior is heavily down-weighted by the kinematics likelihood.

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