Masses and radii of the known transiting extrasolar planets. The plot is restricted to exoplanets with values of the mass until 2.5 M_Jup and radius until 2.0 R_Jup. Grey points denote values taken from the Transiting Extrasolar Planet Catalogue (TEPCat)⁵, (Southworth 2011). Their error bars have been suppressed for clarity. The green point with error bars refers to the position of WASP-174b in the diagram (this work), compared to the possible values of the two parameters reported in the discovery paper (light-red box; Temple et al. 2018). Dotted lines show where density is 2.5, 1.0, 0.5, 0.25 and 0.1 ρ_Jup.