Projections of the distribution of galaxies in the SDSS mock catalogues and their overlaps. The fine green and red pixel in every plot show the projected (on the xy-plane) areas, where galaxies from two mock catalogues can be found, which belong to only one of the two catalogues. Yellow pixels indicate galaxies from both catalogues. The tiny blue crosses indicate galaxies that can be found in both catalogues in the same evolutionary stage (from the same redshift snapshot). Left panel: overlap of two mock catalogues whose coordinate origins are located in the neighbouring corners. Central panel: overlap of two mock catalogues whose origins are located in opposite corners, yet in the same plane (side of the cube). Right panel: overlap of two mock catalogues whose origins are located diagonally, opposite across the entire cube.
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