Fig. 1
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ALMA spectrum of the spectral window centered at 231.121 GHz. The CO line at 230.54 GHz can be identified with a peak intensity of ~20 mJy beam−1. The line absorption is deep because the cloud harbors DR21. In addition, two lines of lower intensity (lower by ~10 orders of magnitude) are identified: 13CS (5−4) at 231.222 GHz and H(30)α at 231.908 GHz.
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