Gradients G₁ and G₂, measured in the adjoining regions, versus planetary parameters: radius R_p of planet in (a), (d), and (g); radius a_orb of orbit in (b), (e), and (h); and the orbital period P_tr in (c),(f), and (i). The plots (a)–(c) and (g)–(i) show all the studied objects (squares with error bars) from Table C.1, while the middle row panels (d)–(f) present only significant (above three standard errors) deviations of |G₁ | from zero (listed in Table 1).