GWB prediction of the NN model compared to three models of the test set of the database. Shaded areas denote the 10th and 90th percentiles of the characteristic strain, while the thin lines with the same colour represent one GWB realisation for each model. Left panel: universe parameters are log₁₀A = 2.359, α = 0.343, β = 1.926, log₁₀M₀ = 8.041, log₁₀ρ = 2.267, and e₀ = 0.056. Middle panel: universe parameters are log₁₀A = −6.599, α = 0.197, β = 1.109, log₁₀M₀ = 8.806, log₁₀ρ = 0.562, and e₀ = 0.079. Right panel: universe parameters are log₁₀A = −5.51, α = 1.293, β = 0.578, log₁₀M₀ = 7.533, log₁₀ρ = 0.73, and e₀ = 0.957.