Mass-radius relations for SW planets (Acuña et al. 2021; Aguichine et al. 2021), planets with Earth-like cores and H/He envelopes (Lopez & Fortney 2014), and rocky planets with different iron contents (bottom three curves; Brugger et al. 2017). The atmospheres in volatile-rich planets are in radiative equilibrium for irradiation temperatures of 1200 K and 1000 K for water and H/He envelopes, respectively. Assuming an age of 4.4 Gyr, the position of TOI-733 b is as highlighted in red. Grey points correspond to planets less massive than 15 M_⊕ with mass and radius data available from the NASA Exoplanet Archive. All planets have a limit on the radius uncertainty of 5%, and a limit on the mass of 15%. The mantle composition follows the model of Brugger et al. (2016) with both CMF and WMF equal to zero, and is made up of silicate rock. Earth has a CMF of 0.32 and a WMF of 0.0005.