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The pairwise potential of mean force Φ2(i, j,1,1) (in kBT) between two phosphate cells (i and j) with a Mg2+ ion in each cell [see Eqs.(16) and (17)], for a DNA oligomer of length L=30 in a 0.01M [Mg2+] solution. The phosphates 1≤i, j≤15 reside in strand 1 and 16≤i, j≤30 in the other strand of DNA.
