Example plots showing the best fitting SEDs (curves) for the extracted SPIRE flux densities (red and blue points) using the flat prior (red) and informed Gaussian prior (blue). The other multi-wavelength data from the COSMOS2015 catalogue (purple) are overplotted. Panel a) is an example of Group A, illustrating how the informed prior can increase the agreement between the best fitting SED and the measured ALMA flux density (green). Panel b) is for Group B, illustrating how the informed and flat priors can give equal agreement between the best fitting SED and the measured ALMA flux density. Panel c) is for Group C, showing how the flat prior can occasionally give better agreement.