Main panel: corner plot showing the posterior probability distributions for the model parameters for the second component. The sharpness parameter β₂ is treated as a free index within the exponential cutoff to characterize the spectral curvature. Inset: the observed spectrum compared with the best-fit model (solid black line). The shaded orange region represents the 1σ (16th–84th percentile) uncertainty envelope derived from 200 Markov Chain Monte Carlo posterior samples, demonstrating the model’s consistency with the data.