Visualization of stability criteria for the triple systems (Toonen et al. 2020, where further details can be found), the shaded area below the red line indicating unstable configurations. The locations of test models are illustrated, assuming m₁ = 25, m₂ = 8.6, m₃ = 6 M_⊙, and P_in = 2.92 d. The range of outer periods and eccentricities are indicated by the labels, for example the model p120ep1 assumes P_out = 120 d and an eccentricity of 0.1 for the outer system. All test models assume prograde orbits of 87° inclination of the orbital planes.