Fig. 2
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Semi-major axes of the four planets (a), the eccentricities of the four planets (b), and the four-body resonance angle of the planetary system (c) during the initialisation of HR 8799’s initial conditions. The data points with error bars indicate the observed values of the semi-major axes, the eccentricities, and the four-body resonance angle (Goździewski & Migaszewski 2020).
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