Simulations on the derivation of M_dust and L_IR. The ratio of derived over input M_dust (left) and L_IR (right) as a function of intrinsic ⟨U_min⟩ for a range of simulated DL07 models mimicking the dynamical range and S/N of the available photometry for our stacked SEDs. For each U_min template the data are colour coded by the density of the points. The pink shaded region encloses the 68% of the derived ratios. Noticeably, the range of the output/input ratios, and thus the corresponding uncertainties are larger for colder templates (U_min < 5.0).