Examples of resonant periodic orbits. Panels a–c: case of a body with a mass anomaly, observed in a frame rotating with the body. Panels d–f: same, but around a triaxial body. Orbits (a) and (d) have the same structure and correspond to the same order of resonance. Orbits (b) and (e) have the same structure but correspond to different resonance orders (one and two, respectively). Orbits (c) and (ſ) have the same structure with one self-intersection point (blue dot) and are associated with resonances of orders two and four, respectively.