Top panels: predicted meso-granulation amplitudes (solid gray symbols) as a function of ν_max for NGC 6791 (squares), NGC 6819 (circles) and NGC 6811 (triangles). Median values of the free parameters have been adopted for each scaling relation, as reported in Table 2. Observed meso-granulation amplitudes are shown in color with open symbols. The left plot shows the results for the model ℳ_a,1, while the right one uses model ℳ_a,2. Bottom panels: the residuals computed as (Observed-Predicted) meso-granulation amplitudes, with same color and symbol type as in Fig. 5a. Bayesian credible intervals of 68.3% are overlaid in both panels.