Observed to modeled flux densities ratios for every photometric band (from 8 μm, top panel, to 500 μm, bottom panel) versus the stellar mass. Points are color-coded according to the reduced χ² associated with the fit. For each wavelength, we indicate the mean value and the standard deviation of the ratios. High-mass systems have larger χ². DL07 models underestimate the 500 μm observations, especially for low-mass systems.