The time evolution of |c_n(t)|² for N = 3 with the initial configuration (0100), i.e., there is only one boson in the left well while two bosons in the right well, which is corresponding to the blue lines in the first panel of Fig. 8. The first panel is for U₃/U₂ = −2 (the condition of Eq. (5) is satisfied) with both U₂ = 6 and U₂ = 0.05, which correspond to panels (a) and (c) in Fig. 8, respectively; the second panel is with respect to U₂ = 0.05 with U₃/U₂ = 2 (the condition of Eq. (5) is not satisfied), which correspond to Fig. 8(d).