The diverse temperature models are illustrated in the bottom panel of Figure . The difference between the temperatures computed with the Boltzmann and Gibbs volume formulations is striking. Although they are similar at low energies, Boltzmann temperature grows much faster, and the difference between the two formulations at 4 eV amounts to about 1400 K. This divergence between Boltzmann and Gibbs volume temperatures is caused by the small size of our model, N = 6, corresponding to a four-atoms molecule. The difference reduces quickly for bigger systems. For a molecule with 15 atoms (N = 39), the temperature difference at 4 eV is only 15 K. Indeed, in the thermodynamic limit ( ) N → , Boltzmann and Gibbs volume temperatures tend to the same values, as we can see comparing Eqs. (18) and (22).