(color online) C(ω) for various α and ε at s = 0.8, Δ = 0.1. (a) : α = 0.48 (solid lines), 0.4 (dashed lines), and 0.1 (dash-dotted lines). (b) : α = 0.49 (solid lines), 0.57 (dashed lines), and 0.7 (dash-dotted lines). For each α value, from top to bottom are curves for ε = 0, 10⁻⁵, and 10⁻³. All curves show behavior in the small ω limit. NRG parameters are Λ = 4, , and .