As Fig. 3, but for the case of a particle emitted at 0.14 AU, close to the outer limit of the trapping region. The solutions for the different models are lying approximately on top of each other. Lower figure: was restricted in vertical range to show clearly the relative positions of the potential barrier and the energy levels. The minimum value of the potential U occurs at U(r)≈ − 4.3 in our (100 km s⁻¹)² units.