Equation Icon  ur g = − 1, (10.54 ) grr = 1 + 2raa Ωa + r2S + O (r3), (10.55 ) [ ] grA = 1-raa + 2-r2Sa + O (r3) ΩAa, (10.56 ) r [ 3 ] AB 1- AB 1- 2 ab A B 3 g = r2 Ω + 3 r S Ωa Ωb + O (r ) . (10.57 )