Two-dimensional stacked posteriors of secondary spectral parameters, the reflection R, soft excess strength q, and scattering fraction f_scatter, which are shown from left to right. Top row: results of the Bayesian method, and the bottom row shows those of the ML method. When an ML model does not include one of these secondary components, the corresponding parameter is fixed to 0. The dashed green line shows the reference where the fitted value equals the true one.