Comparison of the our templates (black solid line) against stacked Spitzer IRS spectra of z = 1 LIRGs (blue, top) and z = 2 ULIRGs (red, bottom) from Fadda et al. (2010). The relative residuals of the fits are shown above the plot for each sample; the region of perfect agreement is shown with a dashed line, surrounded by a ±20% confidence interval. We also show the best fit using other models: CE01 (gray), DH02 (green), and Magdis et al. (2012; purple). In all cases the fit only uses observations at λ> 5 μm, since shorter wavelength can be contaminated by the stellar continuum, as illustrated with the hashed region in the residual plots.