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Fig. 1.

image

Visualisation of how the observed time delay difference τ connects the region between the two multiple image positions, xi and xj of the source at y in the source plane, as required for Eq. (22) to be uniquely solvable. 𝒢 indicates the region of the geometric part of the lensing potential and ψ the plane in which the gravitational lens acts (see Eq. (3)).

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