Figure 8 from He II Emission from Wolf–Rayet Stars as a Tool for Measuring Dust Reddening

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He II Emission from Wolf–Rayet Stars as a Tool for Measuring Dust Reddening

2019 The Astronomical Journal 158 192.

Caption: Figure 8.

Same as Figure 7, but for the logarithmic ratio of the values of the equivalent widths of He II 4686 over He II 1640 vs. the values of He II 1640.