Comparison of GP regression parameters determined in this work and equivalent parameters from Bowman et al. (2020). Top-left panel: ν_char values colour coded by σ_A. Top-right panel: τ_damp values from the GP regression and the steepness of the amplitude spectrum, γ, colour coded by σ_A. Bottom-left panel: ν_char values colour coded by ν_damp. Bottom-right panel: σ_A values from the GP regression and α₀ colour coded by ν_damp.