(color online) High frequency peak of for s = 0.3, Δ = 0.1, α = 0.095, and various ε values. The solid, dashed, dash–dot, and dash–dot–dot lines are for ε = −0.4, −0.3, −0.16, and −0.06482, respectively. The vertical dashes mark out the fitted Rabi frequency (see text). Inset: (circles) and (squares) as functions of ε. The symbols are results for the corresponding ε values of the main figure. The dashed lines mark out the spin flip point where changes sign. NRG parameters are the same as Fig. 1. The broadening parameter B = 0.3 and ʼs are averaged over different z values.