Full 3D separation r_3D (top panels) and 3D intervelocity v_3D (bottom panels) for our base (blue shaded histograms) and full (red solid line) simulation galaxy pair catalogs. Left panels show a comparison with the two randomized samples for which either only the galaxy velocities were shuffled among all considered galaxies or their positions were randomly drawn from a uniform distribution. The middle panels show a comparison among galaxy pairs that share a common halo ID in the simulation with those that do not. Right panels show a comparison of the results for different ranges of the pair primary’s absolute magnitude.