Low-resolution (SL module) IRS spectra of IRAS16399−0937. The integrated spectrum of the system (labeled SYSTEM), extracted from an aperture of radius 7'' is shown, along with spectra extracted from the apertures shown in Figure 3 centered on the IRAS16399N and IRAS16399S nuclei, as well as several locations in the extended envelope (ISM 1–5). The PAH bands and emission lines are labeled. The vertical brown solid lines show the positions of the water ice (~6.0 μm) and HAC (~6.85 μm and 7.25 μm) absorption bands.