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Fig. 1.
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Geometry of a G3L configuration with one source and two lens galaxies on the sky; adapted from Schneider & Watts (2005). Lens galaxies are at angular positions θ1 = θ + ϑ1 and θ2 = θ + ϑ2 on the sky; the source galaxy is at θ. The angle between the source-lens connections is the opening angle ϕ.
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