The database for this study is taken from the supporting information of ref. Frozen-core single-point energy calculations were carried out for each of the 121 species at the CCSD(T)/jul-cc-pVXZ and CCSD(T)/jun-cc-pVXZ levels with X = D, T, and Q. All calculations were carried out using the Gaussian 16 program. Table gives the mean absolute deviation (MAD), root-mean-square deviation (RMSD), and maximum absolute deviation (MaxAD), of the CCSD(T) energies calculated with jun-, jul-, and aug-cc-pVXZ basis sets. In the present context, we can also label these deviations as "errors." These are the results before extrapolation to the CBS limit. The errors are quite large for the VDZ basis sets, and the numbers get better as one goes from VDZ to VTZ to VQZ. In all cases, the jul basis sets perform just as well as the aug basis sets, and he jun basis sets are slightly worse. However, all the errors are still quite large, and even the more expensive QZ calculations don't reach chemical accuracy making them inadequate for accurate quantitative analysis of chemical properties. Next, we consider how two-point extrapolation to the CBS limit improves the calculated energies. Table shows that for the {D,T} extrapolations, the jul basis sets perform just as well as the aug basis sets, and the smallest basis sets, jun, perform the best among the three. As expected, the {T,Q} extrapolation performs better than {D,T} extrapolation for cases. Both jun and jul basis sets perform as well as aug basis sets in the {T,Q} extrapolation (the small differences are not significant). It is also interesting that we obtain similar values of α with jun and jul basis sets as compared to aug basis sets.