Model-predicted hydrogenation and charge states for fullerene C₆₀ as a function of the hydrogen-to-flux ratio, given two different values for the photo-dissociation rate of the even-numbered cationic fulleranes, and two different values for the electron to hydrogen density ratio. Solid lines correspond to singly ionised states and dashed lines to neutral states. The solid and dashed grey lines indicate the respective sums of ion and neutral abundances that are not plotted individually (). The difference between the top and centre panels demonstrates the effect of a 10³ times larger photo-dissociation rate (k_pd) for even compared to odd H cover. Comparison of the centre and bottom panels illustrates the effect of [e]/[H] on the hydrogenation and charge state distribution.