Inclination of the classic Laplace plane with respect to the ecliptic in the eccentric case. It is obtained by considering fixed values of (e, ω_G). The semi-major axis taken as parameter is a = 1000 au. The two panels show the same level curves for two sets of variables. Except in the e = 0 case, this inclination is only “instantaneous” because e and ω_G actually vary. Dark colours are low inclinations, and light colours are high inclinations, as shown by the labelled levels. The thick black level shows the inclination value that is equal to the one obtained in the circular case. The mean inclination, obtained by averaging over ω_G, corresponds to the vertical line ω_G = π∕4 on the top panel, or the diagonal line on the bottom panel.