The relative interaction energies of the different isomers for each cluster size that are calculated with the eb-MBEs and the db-MBEs are compared to the supermolecular reference values in Fig. . The mean and maximum errors in the total and in the relative interaction energies are given in Table . These refer to all considered clusters (the lowestenergy isomer is excluded for the relative interaction energies) and are not normalized to the cluster size.