Equation Icon  ( ) ( ) M-J1δ1- M-J2δ2- 2M--J1γ1δ1 2M--J2γ2δ2 Ksum(Ω ) = K1 (Ω) + K2 (Ω ) ≈ Γ 21 + Γ 22 + iΩ Γ14 + Γ 42 + ... (493 )