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)).
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.