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The frequency ratio F(r12|s1,s2)/F(r12), extracted from the subsets 𝒟ℬi with r12 > 15 Å, as a function of 
On the basis of the observed long-range behavior of the nonspecific potential, α1α2 κ/κ0 is taken to be 15. The imprecision of this value is not very important, since α1α2 κ/κ0 is small in regard with Neff.
