Location of the eccentric equilibrium P as a function of the parameters. The colour shades show the two closed-form obliquity solutions given by Eq. (C.2). Some levels are highlighted in white. The definition regions of the solutions are bounded by curves of the form u = f(η), as labelled on the figures (coloured curves). Among those, u₊ and u₋ are given in Eq. (C.5). The junction points (black labels) are given in Table C.1.