disp +E exch-disp E disp E disp,asymp then its damping function must be adjusted in order to extend the range of the correction to shorter distances, since there is no middle-range compensation from any XC functional. Alternatively, an empirical dispersion correction can be parameterized wholly from benchmark SAPT2+(3) or SAPT2+3 dispersion energies, to obtain an ab initio dispersion correction. A method developed along these lines is SAPT+ai D, where the nomenclature emphasizes that the dispersion correction is faithful to ab initio dispersion energies. SAPT+ai D is a cubic-scaling method with much better accuracy as compared to conventional SAPT0, which is a O(N 5 ) method, and it is demonstrated in Fig. or ALMO-EDA2 dispersion energy and the SAPT2+(3)/aug-cc-pVTZ benchmark. ALMO-EDA2 dispersion energies are computed using Eq. ( ), with PBE0+D3 as the target functional and either HF or HF-PBE as the dispersionless functional, as indicated.