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[35] The eigenvalue of P P | ω P | = ( Mδ/π $^{2}$Γ P )(2 − Γ P ± $_{2}$√$_{1}$ − Γ P ) is not uniquely determined by Γ P . Here we take the smallest of the two solutions, for which the ex- pansion of Eq. (24) is guaranteed to converge. 

