Star-forming continuum templates derived from the star-forming sample. Left: unobscured continua, C_SF(λ), obtained from the fits to the star-forming sample, used as templates for the spectral decomposition. The colour indicates the steepness (8.0 μm–13 μm): the darker the colour, the steeper the continuum. Right: histogram of the optical depths, assuming mixed geometry, for the star-forming sample. The red line shows the half-normal prior used for the spectral decomposition based on these results.