H2CO21,1−21,2 emission contours of the W51 North core overlaid on a) the 14 GHz continuum and b) the NACO K-band continuum image (Barbosa et al. 2008). The contours are at 3 mJy/beam in each channel with width 0.5 km s-1 at velocities 56 (blue) to 60 (red) km s-1.
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