Total angular momentum (top) and energy (bottom) of the system as a function of angular orbital frequency n = 2π/P, scaled to the critical values (see text). The solid curve is the corotation locus (n = Ω_s = 2π/P_rot) for zero eccentricity, and the dashed and dot-dashed curves are the n = 2Ω_s and n = 4Ω_s loci, respectively. The green dashed curve is the constant total angular momentum locus. The position of the KOI-205 system as of today is marked by the square that is zoomed in the insets.