Fig. 3.
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BPT diagram for the sample. Shown are the H I 21 cm detections (blue dots) and the H I 21 cm non-detections (red dots). One of the detections, J1458+3720, does not have any ionisation lines, and hence could not be included in the diagram. Most of the sources that require double Gaussian components to fit their emission lines are also the more powerful AGN (in the Seyfert region of the diagram).
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