Dynamical analysis of the TOI-1266 system based on a MEGNO-map. The size of the map is 100 × 100 pixels, whichexplores the e_b–e_c parameter space at the 2-σ uncertainty level. When ⟨Y (t)⟩→ 2 (purple shaded regions), quasi-periodic orbits are found, while chaotic systems are found when ⟨Y (t)⟩ → 5 (yellow shaded regions). The configuration with the nominal values of e_b and e_c is shown by the blue marker, while the 1-σ uncertainty region is shown by the red box. The three areas, A (stable region), B (transition region), and C (unstable region) have been labelled, and are delimited by the solid black lines, which represent the conditions given by Eqs. (2) and (3).