SED for our set of H ii regions normalised to the emission in the 24 μm band from Spitzer (left panel) and to the FUV emission from GALEX (right panel). The normalisation emphasises the IR part of the SED showing the different behaviours for filled and mixed regions and shell and clear shells objects. The thick lines correspond to the SEDs obtained using the median values at each band for all the H ii regions in each morphological sample.