Planet radius-mass diagram for transiting gas giant planets. The mass axis is plotted in logarithmic scale. The solid lines mark theoretical models taken from Baraffe et al. (2014) for no solid core (black) and a massive core of 100 M_Earth (gray). The dashed lines mark isodensity contours, with the density values labeled at the top right corner in g cm⁻³. The positionof HD 2685 b shows that it is an inflated gas giant planet, like other planets of similar mass. The plot includes planets whose radius uncertainty is smaller than 0.15 R_J and whose mass uncertainty is smaller than a quarter of the measured mass. Data presented in this plot were obtained from the NASA Exoplanet Archive (Akeson et al. 2013) on January 24, 2019.