Low-resolution Spitzer IRS spectrum of the IRAS16399−0937 system, extracted from a circular aperture of radius 7''. The dotted lines indicate the positions of the H₂ S(3) 9.66 μm, H₂ S(2) 12.27μm, and H₂ S(1) 17.03 μm emission lines. The brown solid lines indicate absorption bands of water ice (~6.0 μm) and HACs (~6.85 μm and 7.25 μm). The PAH and silicate features, as well as various ionic emission lines, are labeled.