Fitting the combination of frozen electrostatic energy E elec with the polarization/CT energy has a two-fold reasoning. Traditionally, electrostatic contributions, either originating from polarization or frozen populations, are often grouped into a complete classical picture of interactions separate from those that are more quantum mechanical in nature, such as dispersion and Pauli repulsion. This classical/quantum split can be observed in the common separation of Lennard-Jones interaction from the charge-charge terms in many of the most common force fields. Even when polarization is explicitly accounted for, such as in Drude oscillator models, their charge-charge interactions are often grouped together as a complete electrostatic contribution. Secondly, incorporating E elec energies into this step of the pa-rameterization corrects for any errors introduced in the previous step, in which an over or under representation of frozen electrostatics are compensated for additional contributions in the polarization energy. The resulting fit thus establishes a set of interactions that when combined define a classical depiction of electrostatics/polarization as well as separately self corrects for deficiencies in each individual term.