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<http://schema.org/caption>
"Figure 5. Hertzsprung-Russel Diagram of all planets in our study sample. Symbol size is proportional to M?, which for transiting planets is derived from the transit-based ρ? and for RV planets is derived from log g (see the text). Color represents [Fe/H]. The separation of metal-poor stars below the metal-rich stars on the main sequence is readily apparent. All quantities represented are determined empirically."
<https://www.semanticscholar.org/paper/Accurate-Empirical-Radii-and-Masses-of-Planets-and-Stassun-Collins/b0f0293ad3acb7e228f9be990695d8deefb10217>