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Effect of ions accessibility transition width (a) 2.5 Å, Λil=1 (◆); 1 Å, Λil=10 (◼); 0.5 Å, Λil=1000 (×); and 0 Å (line) on (b) convergence of perturbation series implied by changes in |⟨σΦ1⟩|, |⟨σ2Φ2⟩|, and |⟨σ3Φ3⟩|, where |⟨Φ0⟩|=21.92KT∕e.