Fig. 13.
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Position–velocity diagram (pυ) of the HCN emission in NGC 253. The y-axis shows the centroid velocities from the spectral decomposition, and the x-axis shows the angular distances from the minor axis of NGC 253. We color-coded points by their HCN/CO(2–1) ratio derived from SCOUSE, and the size of each point corresponds to the HCN velocity dispersion.
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