Migration amplitude Δa_J of Jupiter as a function of the FFP’s mass m_FFP in the scenario of the close encounter. The values of m_FFP are given in units of Jupiter masses m_J. For reference, less massive FFPs are indicated by their mass values in units of Earth masses m_E. The phase angles θ of Jupiter are taken to be: (i) the specific value of θ^* = 249° (black symbols); (ii) another representative value of 266° (red symbols). The third parameter of the system, d, is the same as before ().