Normalized spectra of early O-type CSPN (see Table A.3). The interstellar absorption bands at λ4428, the complex at 5780 and 5890-6 are not indicated. The most important spectral features (absorption and emission) identified are: Hβ, Hγ, Hδ, He II λ4200, 4542, and 4686, N V λ4604–19, for the blue spectral range (top panel), and O V λ5114, O VI λ5290, He II λ5412, O III λ5592, C III λ5696, C IV λ5801–12, for the red spectral range (bottom panel).
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