The convergence of the EAs for Ga, Te, and Bi is also shown graphically in Figure , where the explicitly correlated CCSD(T)-F12b results with the aVnZ-F12 and VnZ-F12 basis set families are also compared to the conventional CCSD(T)/aug-cc-pVnZ-PP [denoted aVnZ (conv)] values. For Ga, where the basis set effect on EA is small, it can be seen that explicit correlation with the existing VnZ-F12 basis sets holds almost no advantage over conventional results at the same zeta-level. The addition of the higher angular momentum diffuse functions improves the F12 results and this is particularly striking at the TZ level, where the F12 EA is the same as the conventional aV5Z result. For Te and Bi the effect of using F12 is more apparent, even with the existing VnZ-F12 sets, but it is still clear that the additional diffuse functions included in aVnZ-F12 produce EAs closer to the CBS limit and that CCSD(T)-F12b/aVnZ-F12 rapidly approaches the estimated CBS limit. It was noted above that the EA of the 6p elements are significantly improved by additional functions at the TZ level, and this can be seen for Bi in Figure (right panel), where the overall effect is a smoother and quicker convergence towards the CBS limit. The improvement in convergence Table VI compares the CBS estimates for the EAs of the heavy p-block elements from two different approaches; the CBS(T,Q) approach based on F12 methods used in this work, and the estimates of Finney and Peterson based on conventional CCSD(T) with aug-cc-pwCVnZ-PP (n = Q, 5) basis sets. In the latter, the HF energies were extrapolated using Eqn. 2 (replacing L with the basis set cardinal number n), and extrapolated frozen-core CCSD(T) correlation energies were produced using the formula of Martin: 72