Fig. 4.

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Luminosity-weighted moment-1 measurements in declination for HCN and HCO+ lines. The dashed magenta line represents the best-fit Keplerian rotation model to the HCN data (red squares). The dot-dashed cyan line indicates a linear gradient fit to the HCO+ data (blue triangles). The straight dashed lines in magenta and cyan correspond to a rotating gas ring with a radius of 66 and 92 pc, respectively.
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