Left panel: relative contribution of dehydrogenated states of circumcoronene as a function of depth into the cloud, A_V. The contributions consider all ionization states at which the molecules are present. The curves are shown for the first 4 dehydrogenated states of the parent molecule (N_H = 17−4). Other partially dehydrogenated states contribute in smaller fractions. Right panel: distribution of circumcoronene derivatives at different A_V values where partially dehydrogenated species are observed.