The standard deviation, σ, of the total energies for the calculations among the various codes in each of the four approximations is given as a function of atomic number Z in Fig. 1.
The deviations exhibited in Fig. 1 are seen to increase somewhat with Z, but in no case do they exceed 0.5 microHartrees.
The actual differences between the results of the several codes are shown in the next four figures:
Attainment of our basic criterion of convergence of total energies to microHartree accuracy has led to good agreement between independent calculations of the individual orbital energy eigenvalues. For the cases presented here, all individual orbital eigenvalues agreed to within 2 microHartrees.