Distributions of different parameters over wavelength. Left panel: ratio of the effective radius in each Herschel band to the effective radius in the WISE W1 band; middle panel: distribution of the Sérsic index in each Herschel band; right panel: ratio of the Sérsic index in each Herschel band to the Sérsic index in the WISE W1 band. By the lilac colour we show the subsample of 320 galaxies with reliable fitting results, whereas the dark lilac corresponds to the reference sample of 71 galaxies. The black solid and dark blue dashed lines refer to the simulations from Appendix B with an exponential and Sérsic disc, respectively.