Equation Icon  ∮ [ ∮ ] h μν(τ,xi) = τ-- hμν (τ = 0,yi) dΩ + -1--∂- τ hμν(τ = 0, yi) dΩ . (69 ) H 4π ∂C(τ,xi) ,τ y 4π ∂τ ∂C (τ,xi) y