The BEP is indeed evaluated in Fig. . Notice that two limits define a Ea/ΔE region where a BEP is possible. One is a limit case for earliest TSs -located very close to the reactants energy level-where there is essentially no energy barrier, regardless the value ΔE has, i.e. Ea = 0 eV, and so, basically the linear equation of Ea = a•ΔE + b has a slope a of zero, and a b intercept of 0. On the other hand, latest TSs -located very close to the products energy level-are significant for endothermic situations, where the energy barrier is basically the difference in energy between reactants and products, i.e. Ea = ΔE, and so, basically, the linear equation of Ea = a•ΔE + b has a slope a of one, and a b intercept of 0.