Fig. 5
H2CO 218.48 GHz (left), CH3OH 218.44 GHz (middle) and CH3CN 220.71 GHz (right) maps, revealing that the emission originates from the “A” and “B” cores and the blue flow (marked A, B and F). Contours are overplotted on the continuum emission from van Kempen et al. (2012) in 20, 40, 60 and 80% of the peak line integrated intensity, which is always located at core B.
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