Equation Icon  ˆ ˆ(0) ˆ ˆ ˆ (0) A (Ω) = A (Ω) + χAx (Ω)[F(Ω ) + G (Ω )], B (Ω ) = B (Ω) + χBF (Ω )xˆ(Ω), (128 )