Fig. 1.

The average and RMS errors of the interaction energies of H₂–CO predicted by V₁₅ calculated with respect to the ab initio values for 27 132 geometries with R ≤ 12 bohr. The errors are calculated in the intervals of energy indicated by the vertical dotted lines, except that the points corresponding to the lowest energy range represent the errors calculated for all energies lower then −100 cm⁻¹. The abscissas of the symbols are taken in the middle of these intervals. There are also plotted, for both surfaces, the average values of the positive and the negative errors.