Top: State of the exoplanet mass–radius diagram as of 2018 July 31, from the NASA Exoplanet Archive. The composition curves come from Lopez et al. (2012), except for the “max iron” curve, which is taken from Marcus et al. (2010). The data points’ colors represent their fractional mass uncertainties, with black points having uncertainties <25% of their measured masses, dark blue points having uncertainties from 25% to 50% of their measured mass, and light blue points having uncertainties from 50% to 100% of their measured masses. Our search criteria did not return any planets with fractional mass uncertainties >100%. Bottom: M–R diagram containing the planets we select from the simulated TESS results, showing the TESS radii and “true” masses derived using WRF16.