Below is a spectrum of the protostar IRAS16293-2422 as observed with the Infrared Space Observatory Long Wavelength Spectrometer.

The spectrum covers 140-190 microns and shows features due to the molecules CO, OH and H₂O.

The above plot is from www.cesr.fr/~moly/DSTUF/Rapport-Activite/UF/RAV2UF.html (en Francais)

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