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Fig. 1

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Normalized FORS 2 Stokes I spectra of the 12 central stars in our sample, displayed with a vertical offset of 1 unit between adjacent spectra. The strongest spectral lines are identified. The forbidden [O iii] nebular emission lines close to 5000 Å are marked in green. They may appear in absorption (e.g., NGC 2392) due to imperfect background subtraction.

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