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(a) Interaction energies of MP2, SPL, SPL2, and MPACF-1 as well as reference CCSD(T) curves for Kr2. (b) Errors of different MP AC models for Kr2 at equilibrium, ΔWc,λ = Wc,λmethod – Wc,λ, where the r.h.s. of eq 5 is truncated to fourth order. Wc,λMP4 is taken as a reference (the inset justifies this choice given the (fast) convergence of the MPn series).
