The pre-peaks are seen to decay slower for ethanol than for methanol, and moreover, all atom-atom curves are almost superposed. Both results are quite expected: cluster dynamics in ethanol is intuitively expected to be slower than that of methanol, because of the additional methyl group. The near superposition of all 3 atom-atom curves indicate that the global motion are quite similar, with the OO decay slightly faster than the others. This result suggests that it is really the charge order which drives cluster dynamics. The thinner curves concern global atom-atom contact dynamics, and, as far as species are concern, they follow the same pattern, namely slower for ethanol than for methanol. However, within each species, they dier from the pre-peak behaviour since the atom-atom contact decays are dierent. For alcohols, the OO decay is slower than the OH decay, which is the exact opposite of what we found for the cluster peak dynamics. It suggests that the spatial frequency of the OO and OH motions at contact decays faster than the same atoms in clusters. We believe that this is an important result concerning liquids that have specic cluster peaks in radiation scattering experiment, and that this dierence is related to a more global kinetic of clusters, as opposed to the dynamics of individual atoms within the clusters. Namely, this global dynamics is very dierent between dierent atoms, while being the same when considering the same atoms, but within a cluster.