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Fig. A.1


Interferometric spectra toward a set of selected positions (intensities in K). In addition to our data, we show the spectra of the H2CO 20,210,1, CH3OH 3020 A (blue) and CH3OH 3222 E (black) lines published by Gerin et al. (2015). The systemic velocity, vlsr = 6.7 km s-1, is marked with a dashed red line.

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