Mass vs. radius diagram for all known planets with masses in the range from 0.5 to 20.0 M_⊕ and radii from 0.8 to 5.0 R_⊕. Planets are shown only if the uncertainty in these two parameters is smaller than 30%. Data are retrieved from the NASA Exoplanet Archive (Akeson et al. 2013) as of September 2019. Theoretical models for internal composition of small planets are taken from Zeng et al. (2016). The three planets we discovered and characterized in this paper are marked in red.