Equation Icon  τκ,σ ω (τ κ,σ)2 ξzz = τκ0,σ , ξκx,σx = ξκy,yσ= ------0--κ,σ-- , ξκx,yσ = ξκy,σx = ---B--0-κ,σ--. (218 ) 1 + (ωB τ0 )2 1 + (ωB τ0 )2