TOI-1266 b and c on the mass-radius diagram based on the radii and masses derived from the transit photometry and TTV analyses. Alongside, we show mass radius curves for pure iron (brown), an Earth like composition of 32% iron, and 68% rock (red), a mixture of 50% water with an Earth like core (grey blue), and for pure water (blue). The data of the background planets were taken from the NASA Exoplanet Archive (retrieved on 2020 July 15). We show only those planets thathave a relative mass and radius uncertainty of less than 20%.