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Fig. 6

image

Photocentre shifts of the blue components of all used CO and HCN lines for PA = 0° versus line depth. Colours as in Fig. 4 for the CO lines. Green triangles refer to the HCN lines. Full and open squares denote the 2010 and 2013 CO data, respectively. For each line, the shifts of both nodding positions are plotted.

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