Comparison of the shape alignment between the close halo pairs (i.e., CHs separated from their NN1 by 1 < R_isol/r_vir < 4) of two distinct halo populations, based on their shape, for two extreme environments. Upper panel (Population A): frequency distribution of |cos(θ)|, where θ is the angle between the major axis of the prolate CH and the major axis of its prolate first nearest neighbor (NN1) for two different isolation bins: close halo pairs where the CHs are separated from their NN2 by 1 < R_isol2/r_vir < 4 and close halo pairs where the CHs are separated from their NN2 by 20 < R_isol2/r_vir < 63. Lower panel (Population B): frequency distribution of |cos(θ)|, where θ is the angle between the minor axis of the Oblate CH and the major axis of its prolate first nearest neighbor (NN1) for two different isolation bins: close halo pairs where the CHs are separated from their NN2 by 1 < R_isol2/r_vir < 4 and close halo pairs where the CHs are separated from their NN2 by 15 < R_isol2/r_vir < 63.