(Color on line) Probability ∣ ε ˜ ( t ) ∣ 2 versus Γ t with delay Γ τ 1 = 10 with phase φ 1 = 2 n π + π / 2 (blue dotted line), φ 1 = 2 n π + π (red dashed line), φ 1 = 2 n π (green dash-dotted line) in the following cases: (a) single mode ω A = ( Ω 31 + Ω 11 ) / 2 , (b) two modes ω A = ( Ω 31 + Ω 51 ) / 2 . Here, a = 2 b .