Spatial (top) and redshift (bottom) distribution of galaxies in the region of the galaxy overdensity between A3667 and A3651. The different colors (and corresponding label numbers) show categories of galaxies with a similar redshift identified with the DBSCAN algorithm. By comparing the top and bottom plots, the spatial location of galaxies with certain redshifts can be seen. Galaxies with the label −1 are outliers that could not be identified with one of the categories.