Geometry of our simulation. θ _i is the inclination as constrained by Carilli (1995). R _v is the system's virial radius. R _i is the ionization radius of the cones. θ _o is the opening angle of the ionization cones assumed here to be 90°. R _i , R _v , θ _o , and two variables controlling the velocity field are the model's five tunable parameters.