Equation Icon  ˆF 𝒳ˆ1-(Ω)- ˆ ˆ F -ˆ𝒳2(Ω-) ˆ O1 = χexffx(Ω ) + ℱ(Ω ) + G, O2 = χeffxx(Ω ) + ℱ (Ω) + G (259 )