FIGURE 4.

Map of regimes: ensemble average s ^μ of the standard deviation of the spatially averaged mean phase velocities (A,B) and the frequency cluster ratio (C,D) in the parameter plane of age parameter β and interlayer coupling strength σ for the parenchymal (A,C) and immune layer (B,D), respectively. Bright colors correspond to the formation of frequency clusters. Simulation parameters: N = 200, α ¹¹ = α ²² = −0.28π, α ¹² = α ²¹ = 0, $a_{ij}^1=1$ , ϵ ¹ = 0.03, ϵ ² = 0.3, ω ¹ = ω ² = 0, C = 40. Ensemble size is N _E = 50. The simulation time is 2000 time units, the averaging time window 1000.