Two setups, also represented in Fig. 3, in which turbulence was activated in the simulations only after the formation of the resonance chain. For case (a), Eq. (19) gives α_crit = 6.4 × 10⁻², and for case (b), it yields α_crit = 2.3 × 10⁻². The resulting number of successful simulations as a function of α is shown, which was compared to the expected critical α_crit value (cf. Eq. (19)). The results match the theoretical expectations on the order of magnitude.