In Figures , the DFT approximations are employed without empirical dispersion corrections as these have a little effect on the geometric performance given the relatively small size of the B2se molecules. To see the effect of the dispersion correction for the B2se geometries, in Figure we show a parity plot comparing GEO of TPSS (a metaGGA) enhanced by D3(BJ) against that of bare TPSS. D3(BJ) denotes Grimme's dispersion correction with the dumping function of Becke and Johnson. The GEO values for BLYP and TPSSh 32 are also shown for comparison. We can see from the plot that the addition of D3(BJ) has almost no effect on the GEO values of TPSS. On the contrary, the effect of exact exchange addition is way more profound as the GEO values of TPSSh, which contains 10% of , but within the VnZ basis set (no diffuse functions). The approximations in all three panels are sorted by their respective AVnZ GEO rankings so one can see how the exclusion of the diffuse functions from the basis affects the rankings of approximations. For the same plots within the VnZ basis set, see Figure .