Fig. 15
Gaussian width ratio between Hα and He I (proxy for temperature) vs. normalization ratio between [S II] 6717/6731 Å (proxy for density). Temperature increases upwards, while density increases towards the left. Symbols are as in Fig. 7. The red (blue) vertical dashed line indicates the median [S II] 6717/6731 Å ratio for the receding (approaching) components. On average, the receding component has higher density and lower temperature than the approaching component.
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