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(a) Two diffracted propagation paths. On the left building, the path is diffracted around the entire building with an accumulated diffraction angle φ A > π. The right building shows a diffracted path with φ A > 2π. Depending on the angular threshold value, these paths are dismissed. (b) Wedge with aligned faces F 1 and F 2. Propagation paths to edges that are completely located in the illuminated region of both aligned faces (red area) are diffracted neither from the shadow region of F 2 nor from the shadow region of F 2.
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