Fig. 9.

Expected maximum shifts for all events with a source less than six magnitudes fainter than the lens. The red dots indicate the events where the proper motion and parallax of the source is unkown. The blue dots show the events with a five-parameter solution for the background sources, as well as the determined standard errors. The apparent paucity of events during the Gaia mission time is due to the angular resolution limit of Gaia DR2.
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