Correlation between planet mass (top row), planetary radius (bottom row), and the main stellar parameters: T_eff (left column), M_S (middle column), and [M/H] (right column). The samples are divided into two groups via a fuzzy clustering algorithm applied to the distributions in the right panels. Blue points: Cluster of “larger planets.” Red points: Cluster of ‘smaller planets.” The fitted linear trends of Eqs. (2)–(11) are plotted with solid blue and red lines. Pearson’s r values, corresponding to the giant and smaller exoplanets are also displayed with blue and red, respectively.