(a) Energy as a function of the evolution step of a CALYPSO structure search performed on the LJ₁₀₀ cluster. (b) Energy–distance distribution for the minima searched during the CALYPSO run. The energies are shown relative to the global minimum and the BCM distances were calculated with respect to the isotropic system. Symbols denote the four lbests at the 200th generation, which are shown in the right panel. The numbers below each structure are the energies in ε relative to the global minimum and BCM distances with respect to the isotropic system. See text for detailed structural descriptions. Reprinted from Ref. [49], with the permission of AIP Publishing.