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Fig. 4.

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Measurements from our joint strong lensing and stellar dynamical models with mock IFU stellar kinematics (IDEAL), but for two different parameterisations of the orbital anisotropy profile, βz. The corner plot shows the relevant parameters in the fit, consisting of the lens distance, Dd, int, time-delay distance, DΔt, int, and internal mass-sheet parameter, λint. The mock data are mildly anisotropic (i.e. βz(r) = 0.15 is non-zero and independent of radius) and fitted with both a radially constant (indigo) and radially varying anisotropy profile (teal). The contours highlight the 1σ, 2σ, and 3σ confidence regions, with the black points (lines) depicting the mock input values. The radially constant mock input anisotropy can be recovered from models with a radially varying anisotropy profile.

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