Example of IRS treatment for HS 1304+3529: the raw spectrum is presented in the top panel. The photometry points are overlaid in filled purple diamonds as well as synthetic photometry as blue open diamonds. The galaxy is not detected at 5.8 μm as indicated by the open purple triangle. Green, orange, and red parts of the spectrum represents the SL2 and LL2, SL3 and LL3, SL1 and LL1 spectra, respectively. The middle panel shows the spectra after cutting off the discrepant wavelengths and rescaling to match the photometry. The spline used to rescale SL is shown in Fig. D.2. The bottom panel shows the spectra smoothed to a S/N of 3.