For these examples. which involve very small ligands, a two-body calculation with no electrostatic embedding at all meets the highest-fidelity standard for fragmentation, while keeping the cost extremely low in comparison to fully-converged supramolecular calculations. Avoiding embedding renders these calculations stable in large basis sets, including basis sets that contain diffuse functions. This will be important for future work, where we intend to push fragmentation to levels of theory beyond DFT. As such, we next take a closer look at basis-set convergence.