designates the energy of monomer A calculated in its basis {A}, and E {AB} A its corrected energy calculated in the full {AB} basis that includes ghost functions located on system B. Since it was noticed that ∆E uncorr. and ∆E CP-corr. may converge to the basis set limit from opposite sides, it is sometimes assumed that the average ∆E half-CP energy provides faster convergence , a strategy that we also examine.