Equation Icon  ¯ ′ ′ √ ------∗ X = (izR − z )sin (γ)∕( 1 + K w0), X = (iz + z′)sin (γ)∕(√1--+-K-∗w ), R 0 F = K ∕(2(1 + K0 )), (170 ) F¯ = K ∗∕2, (x) ( X ¯X ) E = exp − -2- .