Mass-radius diagram for planets with mass determinations with a precision better than 30%. The red star is TOI-674b, the orange points are planets orbiting M type stars, and the gray points are planets around other types of stars. The dashed lines represent the mass-radius models of Zeng et al. (2019): planets with pure iron cores (100% Fe, brown line), Earth-like rocky compositions (32.5% Fe plus 67.5% MgSiO₃, black line), 100% water compositions (blue line), and Earth-like composition planet cores with 5% H₂ gaseous envelopes (green line).