Illustration of the orbital configuration modeled by the JADE code. A main planet orbits around a central star. There is also the possibility of adding a distant perturber orbiting around the same star. The orbits are represented by the dotted lines. The vector r links the star to the inner planet, while R links the center of mass of the star and the inner planet to the distant perturber. They illustrate the hierarchical Jacobi coordinates used in this kind of dynamical problem.