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Effective range of integration in equation (21), \(R(p_0,V)=\sqrt{|\overline{x'^2}|} \approx 2/\alpha\) vs. s in equation (2), for a shallow Eckart well, and \(p_0/\alpha =0.001\) (solid). Also shown by the dashed line is an approximation \(R(p,V) \approx \sqrt{2/(p_0|s-1|)}.\)
