Several examples of the energy distribution of escaping molecules for three different incidence energies including 100 eV, 1 keV, and 10 keV, all assuming normal incidence. Distributions of escaping N₂ and CH₄ molecules are shown separately in the left and right panels, respectively. The probability distribution tends to decline near monotonically with increasing energy, which is reasonably well described by a power law as given by the thick solid line in each panel. Such a power law trend extends all the way from the local escape energy to a turnoff energy above which the distribution declines rapidly to zero. The best-fit power index is indicated in each panel for reference.