Fig. 1
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Systems within 5% of resonant chains involving the 3:2 and 2:1 period ratio commensurabilities between adjacent planet pairs. Data have been taken from the Exoplanet Catalog (https://exoplanet.eu/catalog/). The size of the dots indicates planetary masses: large dots represent planets with masses of at least 1 mJup, while smaller dots correspond to less massive planets.
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