Figure displays the statistics of the differences between GTO and PW contributions to the MP2 interaction energy. For HF, the CP uncorrected or half-corrected energies converge from below and confirm that the BSSE tends to overbind dimer systems at the HF level. Once the BSSE is removed by the CP correction, HF energies converge faster and from above, which is the expected behavior from a gradual decrease of the (sole) BSIE as the size of the basis set increases . The augmented basis converges slightly faster than its standard counterpart, certainly due to its larger size and spatial extent for the same cardinal number. When CP-corrected, the HF energies are already converged within less than 0.2 kcal/mol for the triple (T) zeta bases. Overall, at each cardinal number, the CP-corrected results obtained with the augmented basis sets provide the best agreement with PWs as also reported in Table . The remarkably small deviations at the HF level between the Q/5 zeta all-electron GTOs and PWs support the fact that the use of pseudopotentials does not cause any spurious differences between the PW (pseudopotential) and the GTO (all-electron) results.