Notes. The upper table shows the activation energies, E_act, and change in entropy, ΔS, for the normal-to-dehydrogenated states (N_H≤), while the bottom table shows the dissociation parameters for the superhydrogenated states (). N_solo corresponds to the number of solo H atoms of each molecule, i.e., 0 for coronene, 6 for circumcoronene and 12 for circumcircumcoronene. Dissociation parameters for normal-to-dehydrogenated molecules are taken from Ling et al. (1995). The activation energies considered for the H-loss from superhydrogenated molecules are taken from the theoretical work of Bauschlicher & Ricca (2014). These corresponds to the energies required to remove the extra H atom in a duo ring.