Fig. E.1.
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Average HI spectrum from Adams & Oosterloo (2018) (in rescaled units; red dashed line) and this work’s CO spectrum of the north cloud (gray solid line), with the detected CO peak (yellow area). The velocity offset of the CO emission line peak with respect to the HI peak (∼60 km s−1) suggests the extreme physical conditions that the north cloud is exposed to, which are discussed in Sect. 3.
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