Fig. 6
Blue columns: observed orbital period ratio P2/P1 for 36 exoplanetary pairs in the vicinity of the 2:1 resonance. Gray histograms result of 400 Monte Carlo simulations as obtained from Eq. (3) with random assigned values for masses and disk parameters (see text for details). Orange histograms previous values evolved through tidal effects for the duration of the lifespans of the systems.
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