Fig. 4. SWS spectrum in the Orion nebula at the position shown in Fig. 2. A fit to the spectrum (see Sect. 3 for details) is shown which uses amorphous astronomical silicate (130 K: bold dashed-dotted, and 80 K: light dashed-dotted), amorphous carbon (155 K: bold dashed, and 85 K: light dashed), and amorphous carbon VSGs (300 K: dotted). The total calculated spectrum is given by the thin solid line. The identification of the strongest spectral features is indicated.