The upper panel, middle panel, and bottom panel denote the distribution of CP, the distribution of flux, and the scatter plot of flux CP, respectively. We adopt below physical parameters: γ = 100, ω = ω _c , ρ = 10⁷ cm, Δθ _s = 10⁻³. The unit of d ² W/d ω dΩ is arbitrary. The red line and the blue line denote 10⁻¹ and 10⁻² times the maximum flux, respectively.