Mass-radius for low-mass (Mp < 10 M⊕), small (Rp < 3 M⊕) planets with mass-radius measurements better than 25% (from http://www.astro.keele.ac.uk/jkt/tepcat/; Southworth et al. 2007). Composition models from Zeng et al. (2016) are displayed with different lines and colors. The solid red circle marks the position of π Men c.
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