Interferometric spectra toward a set of selected positions (intensities in K). In addition to our data, we show the spectra of the H2CO 20,2−10,1, CH3OH 30−20 A (blue) and CH3OH 32−22 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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