Equation Icon  ∂ u = e0 − Ω ea, (166 ) α α[ a α ] a a a b 1- 2 a 3 0 ∂αˆx = − ra − rω bΩ + 2r S + 𝒪 (r ) eα [ ( ) ] + δab + raa − rωacΩc + 1-r2Sa Ωb + 1r2Sab + 𝒪(r3) ebα. (167 ) 3 6