Transmission spectrum metric as a function of planetary radius for the five planets in the HD 23472 and the well characterised small planet population. We show all planets from the exoplanet archive with precision in mass and radius better than 50%. The planets with mass derived by RVs are shown as circles and the planets with mass derived by TTVs are shown as squares. The color of the points indicates the planet effective temperature. The planets in the HD 23472 are clearly marked. This graph was created using the mass radius diagram code (https://github.com/odemangeon/mass-radius_diagram).