As a percentage of ∆E, the DLPNO errors are largest for the dispersion-bound subset of S66 and smallest for the hydrogen-bonded subset; see Fig. . In part, this reflects smaller interaction energies for the dispersiondominated dimers, though it is also consistent with the idea that dispersion is sensitive to tails of the density and to the "weak" (or distant) pairs. Even for the dispersion-dominated complexes, however, DLPNO errors amount to less than 4% of ∆E.