Equation Icon  2 2 2 2 2 2 (ℰ∕TM2 ) = 1 + |⃗∇y | + |⃗∇z | + (⃗∇y × ⃗∇z ) = (1 − ⃗∇y × ⃗∇z ) + |∇⃗y − ⋆∇⃗z | . (262 )