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Equation Icon  ∫ ( ) ( ) Γ A (f) =-3- dˆΩ ei2πfLa(1+ ˆΩ⋅ˆpa) − 1 e−i2πfLb(1+ ˆΩ⋅ˆpb) − 1 F A(ˆΩ )FA (ˆΩ), (121 ) ab 4π S2 a b