Fig. 1
CH3OCH3 spectrum at 99.325 GHz in the prestellar core L1689B. Three lines corresponding to the AA, EE, EA, and AE symmetry substates (AE and EA being at the same frequency) are clearly detected at the >7σ level. The vertical dotted lines indicate the rest frequencies measured in the laboratory and listed in the CDMS database (Müller et al. 2001).
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