Equation Icon  u = ξb(τ)^l , τ = T (u ,ζ, ¯ζ) (E.2 ) B b B L (uB,ζ, ¯ζ) = ξa(τ)mˆa (ζ, ¯ζ), L-(u ,ζ, ¯ζ) = ξa(τ)mˆ (ζ, ¯ζ). B a