Mass-density diagram of transiting exoplanets with well-established mass and radius from the NASA Exoplanet archive along with some theoretical composition curves. All densities are normalised to the Earth-like density track. The purple squares highlight the transiting planets orbiting K-dwarfs. The green blobs show the mass and radius posteriors (1- and 2-σ contours) of TOI-238 b and c. The shaded regions highlight the high-density and low-density groups of exoplanets. The planets of the solar system are included as reference.