Survival rate of an additional Earth-mass planet in the TOI-1266 system. The results of a dynamical stability analysis that placed an Earth-mass within the system in the semi-major axis range of 0.05–0.20 au and evaluated the overall system stability for a period of 10⁶ yr (see description in Sect. 5.2.2). These results demonstrate that there are few viable orbits allowed in the range 0.064–0.131 au, but that additional terrestrial planets may exist in the system outside of that range.