Nevertheless, when computing the coupling energy within a mechanical embedding approach using in vacuo derived atomic charges, incorporating polarization effects improves dramatically the quality of the mechanical embedding approach (polarizable mechanical approach), thereby reducing deviations from the reference method. Additionally, a correction for the QM distortion energy can be outlined from the polarization energy, being nearly half its value and of opposite sign. We examined two sets of parameters: one determined solely by the element, approximating its value using the recommended value for the isolated atom;