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Equation Icon  2 2 2 2 σab ≡ ⟨Sa∫b⟩ −∞ ⟨Sab⟩ ≈ ⟨S ab⟩ | | ≈ T- dfP (|f|)P (|f|)|&tidle;Q (f)|2, (114 ) 4 −∞ a b | ab |