Equation Icon  { } a 2 a2 1 2 2 2 a 1 2 a b 3 v = u + 2r 1− raa(u)Ω + r [aa(u)Ω ] − 3r ˙a0(u) − 3r a˙a (u )Ω − 3r Ra0b0(u)Ω Ω + 𝒪 (r ) , (229 )