Mass-radius diagram for known planets with masses up to 100 M⊕. In yellow are the planets with mass measurements obtained by radial velocities and in green the planets with mass measurements obtained from TTVs. The data are given by the The Extrasolar Planets Encyclopaedia. Our results are shown in red (Kepler-9b) and in blue (Kepler-9c). For comparison also the values of Saturn, Uranus, and Neptune are shown, the Neptune-like planet pair of our solar system.
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