Fig. 7
Combined spectra for the spectroscopically confirmed sub-samples of PNs belonging to the halo (upper panel), IC high-velocity (central panel) and IC low-velocity (bottom panel) classes. As expected from atomic physics, the [OIII]λ4959/5007 Å doublet is detected with a flux ratio 1:3 confirming that the large majority of our candidates are true PNs (see text for more details).
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