Initial conditions for the 1D parameter studies of CW–CH interaction. Left upper panel: initial density distribution including a realistic density profile for different CH densities (ρ_CH = 0.1, ρ_CH = 0.3, and ρ_CH = 0.5) but with constant values for the initial enhancement and depletion amplitudes (ρ_IAE = 1.1, ρ_IAD = 0.9) and constant initial widths (w_E = w_D = 0.1). Right upper panel: initial density distribution for different initial depletion amplitudes (ρ_IAD = 0.95, 0.9, 0.8) but with a constant initial enhanced amplitude (ρ_IAE = 1.1), constant enhancement and depletion widths (w_E = w_D = 0.1), and a constant CH density (ρ_CH = 0.1). Left lower panel: initial density distribution for different initial depletion widths but with constant initial enhancement and depletion amplitudes and a constant CH density. Right lower panel: initial density distribution for different initial CHB gradients (one sharp gradient and two smooth CHB gradients) and a constant initial wave density profile, that is, constant initial density amplitudes (ρ_IAE = 1.1, ρ_IAD = 0.9) and constant initial widths (w_E = w_D = 0.1).