Testing a three-parameter function (J_R = a ⋅ (h − b)^α or ) to describe the relationships between radial action J_R and scale height h for the thin and thick disks. As done in Fig. 5, the maximum likelihood (ML) and Bayesian estimations were both applied. The best-fit value for α can be found in the legend. The results from Bayesian inference are more favored, as this method directly compares the model with data.