Spectral functions A(ω) in coupled DQD, (a) at the medium temperature of T = 4.0Δ and specific intradot Coulomb coupling U = 7.5Δ with various tunneling coupling t; (b) at specific effective anti-ferromagnetic energy J = 3.5Δ at various temperatures T; (c) at the medium temperature of T = 4.0Δ and specific t = 3.0Δ with various U; (d) at the medium temperature of T = 4.0Δ and specific U = 7.5Δ, t = 3.0Δ with various hybridizations Δ_m. All parameters are in units of Δ = 0.2 meV.