Fig. 1.
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Noise level obtained with ALMA observation of the nucleus of M31 in the CO(3–2) frequency range. The left panel displays the noise level achieved for Δv = 1000 km/s. The beam is presented in the lower left corner. In the right panel, the 2 mJy CO(1–0) signal expected by Chang et al. (2007), assuming R13 = 1.8, is superimposed on the noise map.
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