Equation Icon  1- γ′ δ′ 3 σα′β′ = gα′β′ − 3R α′γ′β′δ′σ σ + O (𝜖 ), (6.7 ) β′( 1 ′ ′) σα′β = − g β gα′β′ + -R α′γ′β′δ′σγ σδ + O (𝜖3), (6.8 ) ( 6 ) σαβ = gα′gβ′′ gα′β′ − 1R α′γ′β′δ′σ γ′σ δ′ + O (𝜖3). (6.9 ) α β 3