§a: a > -1/3, no acc., qualitatively similar to linear EoS
(different singularity)
§b: -1< a <-1/3, acceleration and
loitering below a threshold r
§c: a < -1, rL , de Sitter attractor, phantom for r < rL
§b and c show Einstein saddle point
§parabola: K=0; above
K=+1, below K=-1. Expansion for y>0
§dots: various fixed
points; thick lines: separatrices