In the development of the SPC/E water model, the authors argued that because the atomic partial charges include the effects of mean-field polarization in the condensed phase, there exists an implicit energetic cost of polarization that should increase the potential energy of each water molecule in the liquid simulation. Thus, in order to fit the heat of vaporization, a polarization correction of +5.22 kJ mol was added to the simulated potential energy of each molecule in the liquid. The development of the TIP4P-Ew model included a polarization correction and a simple quantum correction derived from making harmonic approximations to the high-frequency vibrational modes of liquid water, as well as some more minor nonideality corrections. In summary, these corrections increase the complexity of the parameterization procedure, require additional experimental data for the compounds being parameterized, and introduce uncertainty because they only approximately model the effects they are supposed to correct. Moreover, classical force fields are not uniform in how or whether the corrections are applied; for example, the OPLS-AA force field for organic liquids was developed by fitting Monte Carlo simulated density and heat of vaporization to experiments without corrections. For these reasons, it is desirable to use physical properties that require fewer post-hoc corrections when fitting parameters to improve agreement with experiment.