Structure of the secular phase space of the standard system for the following four different values of the DPAM (J = H^∗/L^∗): 0.1 and –0.1 (top panels), and 0.3 and –0.3 (bottom panels). The left panels show the (ω^∗−e^∗) plane, and the right panels show the (ω^∗−I^∗)-plane. Although the dynamical structure is similar, the position of the equilibrium points in the e^∗-axis (and I^∗-axis) and the extension of the phase space decrease with the increase of J.