If γ is now used in place of GEO to rank the approximations, the rankings are preserved with few exceptions when the differences in numbers are marginal. This is illustrated in Figure , where we repeat Figure , but with bars denoting mean γ values of approximations, which range from ∼ 0.2% to ∼ 1.7%. If one wants to estimate GEO values for a molecule that is larger than those of B2se, it can be done from: GEO ∼ γ 2 D/2, by using the average γ values reported in Figure and K of that specific molecule.