ISO-SWS spectra for the OH/IR stars. The data are taken from Sloan et al. (2003). For the sources OH 21.5+0.5 and IRAS 21554 the flux levels go below zero in regions below 5 μm and in the 9.7 μm band. Those negative flux values are indicated with gray dots. Peaks in the opacity curve of crystalline olivine at 11.3, 23.5, 27.5 and 33.5 μm are indicated with vertical gray lines.
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