Equation Icon  ( ) ¯δ ¯𝜖 tail ⟨γ¯α¯β;¯γ⟩ = − 4m u(α¯R β¯)¯δ¯γ¯𝜖 + R ¯α¯δ¯β¯𝜖u ¯γ u u + γ¯α¯β¯γ, (19.57 )