Normalized spectra of WD CSPN (see Table A.3). You should note the wide absorption lines. 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. Red range as Fig. A.1.
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