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Fig. A.1.

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Measurements from our joint strong lensing and stellar dynamical models, without any kinematic data (grey) and with mock IFU stellar kinematics (orange and blue) and an increased statistical error of δvstat = 3.5% for the kinematics. In concordance with Fig. 3, the plot shows the constraints for the most relevant parameters in the fit: the lens distance, Dd, int, time-delay distance DΔt, int, internal mass-sheet parameter, λint, and orbital anisotropy, βz. The contours highlight the 1σ, 2σ, and 3σ confidence regions. The black points (lines) depict the mock input values. The increased error of 3.5% for each velocity bin translates to larger uncertainties on DΔt, int and λint. The uncertainties on Dd, int are dictated by the systematic offset (δvsys) and are unchanged with respect to the models in Sect. 4.1, given the same bias of −2% in .

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