Similar to what was observed for barrier heights, the performance of B(α)LYP+D3 shows little variation across the range 20 ≤ α ≤ 50, with WTMAD2 values of 5.3 kcal/mol (α = 20) and 5.2 kcal/mol (α = 50) for the endpoints of that range. All of the functionals in this range perform slightly worse than B3LYP+D3, corresponding to WTMAD2 values that are ∼ 0.6 kcal/mol larger and MAEs that are about 1 kcal/mol larger (see Tables ). At the same time, these B(α)LYP+D3 functionals are superior to BLYP+D3, by ∼ 1.6 kcal/mol in the WTMAD2 metric. In contrast, values α ≥ 60 afford errors that are comparable to (or even larger than) those exhibited by BLYP+D3, which is unacceptable for a hybrid functional.