Two-point probabilities for the Shapley member clusters as a function of the opening angle $\sqrt{\mathrm{\Omega }}$ of the cone spanned by the observed and simulated relative position of the secondary cluster to the main. The shaded gray regions reflect the mass uncertainty of the secondary halo. The vertical red line indicates the deviation angle measured in the SLOW simulation. The x value of the intersect of this line with the angular probability function gives the probability of finding the secondary within the deviation cone in a random simulation.