Figure : Incremental contributions to the total interaction energy E int = E frz + E pol + E ct from frozen, polarization, and charge-transfer energies for H-bonded base pairs. From left to right, each plot depicts the energy profiles along the x, ŷ, and ẑ directions as defined in Figure . The 0 Å separation distance is defined w.r.t. the ωB97X-V/cc-pVDZ minimum energy geometry of the base pair. Solid and dashed lines are AmberFD and DFT energies, respectively.