Theoretical phase diagrams of the MMRs that we investigated. Our initial conditions are figured in dark gray and the chaotic zone of Fom c in light gray. The chaotic zone of Fom c is considered to extend from 3.5 R_H inner to the periastron of Fom c, to 3.5 R_H outer to the apastron of Fom c. Particles that start on a trajectory allowing these particles to cross the chaotic zone may then be scattered and set on a Fom b-like orbit.