Possible secular trajectories for the HD 74156 system seen in the (ω1,e1) plane for two different values of the initial mutual inclination, I0 = 40° (top), and I0 = 50° (bottom). We show the trajectories using the quadrupolar approximation, corresponding to the level curves of constant energy. Each one corresponds to an initial value of the argument of the periastron ω1, ranging from 0° (black) to 90° (red) with a step of 10°. The dashed black curves correspond to the observed eccentricity of the planet, that is, it gives the initial condition for ω1. All trajectories are compatible with the current knowledge for this system (Table 1).
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