Same as Fig. 4 for a repulsion event in the Sigma_3times simulation, which occurred between t = 1945 to 1952 P_orb. The embryos approach each other in the apocentre and the pericentre, respectively, with spiral arms “aligned”. There is an overdensity between the Hill spheres during the closest approach, and yet another spiral arm originating from the inner embryo 2 after the close approach.