Normalized spectra of late 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 I λ4471, and λ4921, He II λ4200, 4542, and 4686, for the blue spectral range (top panel), and the same spectral features as Fig. A.1 for the red spectral range (bottom panel).
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