Fig. 1
Normalized spectra of O-type CSPN grouped according to their spectral classification: O3I and O3V (see Table 1). The interstellar absorption band at λ4428 are not indicated. The most important spectral features (absorption or emission) identified are Hβ, Hγ, and Hδ. He iλ4026, 4121, 4144, 4169, 4471, and 4713. He iiλ4200, 4541, and 4686. N vλ4604-19.
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