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Fig. 3

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Left: the si-histograms of the two catalogs with 1980 quasars in the simply connected Euclidean space and in the slab space. si is the number of final candidate quadruplets that include the quasar Pi. In the slab space, a hill constituted by topological ghosts is clearly seen. Right: the objects with si ≥ 7 in the slab space. It can be seen that they are linked by parallel translation.

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