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Fig. A.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. For each object, the displayed spectra (blue) define wavelength set all (entire spectrum), gaps indicating the excluded regions, while wavelength set star (clean stellar lines only) is obtained by excluding the regions marked by the (red) horizontal bars 0.2 units below the respective stellar continuum.

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