Median SEDs of the local (U)LIRGs, separated in classes based on their merging stage. Classes ‘s’, ‘m’, and ‘M1’ are presented in the three top panels (from left to right), and classes ‘M2’, ‘M3, and ‘M4’ are presented in the three middle panels, while in the bottom-left panel the median SED of the ‘M5’ class is plotted. The curves and the shaded areas are coloured in the same manner as in Fig. 2. The bottom-right panel shows the comparison among the median SEDs of ‘s’, ‘M1’, and ‘M3’ classes, allowing for the differences to be spotted.