Histograms of the period ratios Pb/Pc (left panel), Pc/Pd (middle panel) and Pd/Pe (right panel) derived from the semi-major axis posterior PDFs given in Figs. 7 to 10 and adopting 1.51 M⊙ for the host star mass. These period ratios allow to identify which mean-motion resonances are compatible with the allowable orbits derived from our MCMC analysis. It appears clear that the most compatible mean-motion resonance is 1e:2d:4c:8b.
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