Fig. 4.
DS map on (M2, ϖ2) plane for K2-21. The long-term stability is guaranteed in the dark-coloured regions. Dark (pale) domains correspond to stable (chaotic) domains in phase space as ascribed by the logarithmic values of the DFLI (coloured bar). The red crosses represent the initial conditions of the evolutions highlighted in Figs. 5 and 6.
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