Long-term evolution of the HD 74156 system with I₀ = 50° for different values of the argument of the periastron, ω₁ = 30°a); 60°b); and 90°c). As a function of time, we plot the mutual inclination I (top) and the eccentricities e₁ (blue) and e₂ (green) (middle). As a function of ω₁, we plot again the mutual inclination, where the color of each dot becomes darker with time (bottom).