Results from the photochemical model using electron-impact ionization and electron-impact dissociation rates computed by TRANSPlanets with a not renormalized precipitation flux j*(E). (a) Mole fractions of the main neutral species. The horizontal bars represent Voyager 2 measurements as presented in Krasnopolsky et al. (1993). (b) Number density profiles of the main ions. The electron profile can be compared with the profiles presented in Tyler et al. (1989).