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The electrostatic potential difference between B3LYP/6-311++G** and DFTB3/3OB (left) and DFTB3/3OB using the auxiliary atomic multipoles (right) evaluated on the solvent accessible surface of butanoic acid. Blue and red indicate that the semiempirical model requires more negative charge and more positive charge relative to B3LYP reference, respectively. Colors are bounded with a range ±0.003 a.u.
