10^{−3} 10^{−2} 10^{−1} 10^{0} 10^{1} 10^{2} |G(ωτ_{0})|10^{−2}  10^{−1}  10^{0}  10^{1} ωτ^{0}  −1.0 −0.5 0.0 0.5 1.0 1.5 Arg G/π (1,0)