Fig. A.1
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Scatter plot of the proper frequency s3 and the 13 parameters involved (the stellar mass and the masses and semi-major axes of planets 1 to 6). The black dots show 150 000 realisations of the Lagrange-Laplace system with the mass and semi-major axis uncertainties from Table 1. The red label gives Spearman’s correlation coefficient ρS as computed from 106 realisations.
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