Comparison between the clumpy disc+wind H17 model parameters combined probability distributions for the optical classification: for the radial dust-cloud distribution power law index (a) shown in the left panel and for the dust-cloud distribution power law along the wind (a_w) in the right panel. Blue dot-dashed, green dashed, and red solid lines represent the parameter distributions of Sy1, Sy1.8/1.9, and Sy2 galaxies, respectively.