Equation Icon  [ ] ( ) [ ]( ) dˆxa = 1-Rac0dˆxcˆxd + 𝒪 (s3) ¯e0βdxβ + δab + 1Racbdˆxcˆxd + 𝒪 (s3) ¯ebβdx β , (120 ) 2 6