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Fig. 1.


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Normalized stacked SDSS spectra in bins of fesc: Nonleakers (red), weak leakers (orange), strong leakers (green), and very strong leakers (blue). Regions around He II 4686 Å and Hβ 4861 Å are highlighted in gray. He II is detected in the four stacks with S/N ∼ 2 − 3. Other faint lines are also detected ([Fe III] 4658 Å, [Ar IV]+He I 4712 Å, and [Ar IV 4740 Å), and their positions are marked with dashed gray lines.

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