Distribution of the difference between the fitted and true values of β_int and the colour excess for a randomly selected galaxy, shown in the left panel. Crosses mark the medians, and contours enclose the 1σ confidence regions of the posterior distributions for each SFH model. A negative correlation is evident between the two quantities. Among the models, the constant SFH model yields the largest overestimation of β_int, followed by the double power-law and flexible models. This trend appears in most galaxies in our sample, independent of the dust model adopted. The middle panel presents the resulting distribution of the recovered colour excess, while the right panel displays the distribution of the A_V offset, which is directly related to the colour excess attributed to their positive correlation.