Figure 2.

Overall RMSEs of the interaction energies $\text{IE}({\text{Gly}}_m{\text{:Gly}}_n)$, many-body interaction energies $\text{ME}({\text{Gly}}_m{\text{:Gly}}_n)$ (left), as well as the nonadditive contribution ${\text{ME}}_{\text{NA}}({\text{Gly}}_m{\text{:Gly}}_n)$ and the additive contribution ${\text{ME}}_{\mathrm{A}}({\text{Gly}}_m{\text{:Gly}}_n)$ to the many-body interaction energies (right) of the tested force fields with the $\omega \text{B97X}-\mathrm{D}$/aug-cc-pVTZ calculated results.