Stability analysis of the K2-24 planetary system. For fixed initial conditions (Table 4), the parameter space of the system was explored by varying the orbital period and the eccentricity of planet -b (top panel) and of planet -c (bottom panel). The step size is 0.0025 in the eccentricities, 0.0025 d in the orbital period of planet b, and 0.005 d in the orbital period of planet c. For each initial condition, the system was integrated over 10⁴ yr, and a stability indicator was calculated, which involved a frequency analysis of the mean longitude of the inner planet. The chaotic diffusion was measured by the variation in the frequency (see text). Red points correspond to highly unstable orbits, while blue points correspond to orbits that are likely to be stable on gigayear timescales. The white dots show the values of the best-fit solution (Table 4).