Normalized spectra of early B-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 λ4026, 4121, 4387, 4471, 4713, and 4921, C III λ4650, for the blue spectral range (top panel), and same features as Fig. A.1 for the red spectral range (bottom panel).
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