Evolution of the ring of particles, each with a mass of 4.5 × 10¹⁶ kg, for an A in the range [14–21]. Top panel: survival times for particles. Middle panel: final semi-major axis of the small moons and Charon. Bottom panel: final eccentricity of Charon and the particles. The mass growth of Charon is set to 10⁴ yr. Blue is used to indicate orbital parameters of Charon and orange for the particles. Orange dots represent survivors (the particles that remain close to initial configurations during the integration time of 3 × 10⁶ yr). The black points in the top panel identify those particles that escape while the PC binary evolves. The shaded grey region indicates the range of values according to diverse authors (see Table 1).