Animation 1 corresponds to Fig. 1 of Friedman+2013 for the case in which events A and B appear on opposite sides of the sky as seen from Earth (α = 180 degrees). The redshifts z_A and z_B of each event are changed in tandem to maintain the condition that their past light cones intersect at the big bang (τ_AB=0) at the end of inflation. The movie explores a portion of the parameter space in the z_A-z_B plane shown in Fig 3b of Friedman+2013; as z_A and z_B are changed while maintaining the condition τ_AB=0, each frame of the movie traces out a portion of the black curve in Fig 3b of Friedman+2013 corresponding to an angular separation of α = 180 degrees.