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DF-SCS-MP2/aug-cc-pVTZ interaction energies (kcal/mol) for canonical A-form and B-form base-stacking conformations. The optimized geometry is the MP2/cc-pVDZ optimization of the intramolecular coordinates. The planar geometry restricts the base monomers to planar geometries, but allows other intramolecular coordinates to optimize.
