Mass-radius diagram for planets with mass <20 M_⊕ and radius <4 R_⊕, selected from the TEPCAT sample, available at https://www.astro.keele.ac.uk/jkt/tepcat/ (updated to 22 March 2023; Southworth 2011). The grey dots represent planets with mass and radius measured with a relative precision lower than 20% and 10%, respectively. The planets of the HIP 29442 system are indicated by black triangles. The 1σ confidence intervals for the radius measurements are shown as black lines, while the red dashed lines indicate the 3σ confidence intervals. The overplotted theoretical curves are derived by assuming equations of state detailed in Leleu et al. (2021).