Equation Icon  { } 1- a 3-2[ a]2 1-2 1-2 a 1- 2 a b 3 s = r 1 − 2raa(u)Ω + 8r aa(u)Ω − 8r ˙a0(u) − 6r a˙a (u )Ω − 6r Ra0b0(u )Ω Ω + O (r )(11.3 )