Contributions of each individual slab model with the colour representing the excitation temperature of the respective slab. The contributions are shown for the best fitting parametric models of DR Tau (type N), FT Tau (type E), and CX Tau (type P). The contributions are taken as the percentage with respect to the maximum line flux in the full model. We note that the maximum line flux of CX Tau is at least a factor of 5 lower than that of the other two types.