Fig. 15

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HCN and HNC emission in the interaction region. Top: average integrated intensities of HCN (in blue) and HNC (in red) across the interaction region in the western lobe of DR21. Intensities are integrated from −35 to 35 and from −15 to 10 km s−1 for HCN and HNC, respectively. The HNC emission is scaled up by a factor of 5 for clarity. Bottom: ratio of HCN over HNC across the interaction region.
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