Note that in a general case the pairwise terms would be different for each A, but in the present case the three diatomics are all the same, so the functions (but not their values) on the right had side are the same for all A. The same 𝑉 3N(RS) 9𝑟 𝐴,𝑛 ; is used for all fourteen states and is given elsewhere. The SR functional form is an even-tempered Gaussian function,