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Fig. A.4.
Upper and lower ring. Comparison of images which show only the upper (left) or lower (right) ring, omitting the other (as before, a* = 0, i = 20 deg, θoffset = 1 rad, rring = 6 rg). The integrated flux density received from the lower ring is about 30% higher than that from the upper ring, due to gravitational lensing.
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