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Fig. 8.
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BP (blue) and RP (red) spectra typical of PNe, WC or WN stars, and Be stars. The wavelength position of the strongest features is noted, while the Hα line is represented by the vertical broken line. The wavelength domains considered for ELS classification are shown with colour shades; see Sect. 6.1.3 and Appendix A.4.
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