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Fig. 1

image

ESPaDOnS spectra of WD 2047+372 (left panel) and WD 2359-434 (right panel). Both panels are organised in a similar way. The top four solid lines show the intensity I spectra, and the lowest solid lines represent the corresponding circular polarisation V spectra of the Hα region. For WD 2047+372 the spectra numbers are 1975651, 1976104, 1976387, 1976638; for WD 2359-434 the spectra are 1975659, 1976391, 1976646, and 1974336. In between the four ESPaDOnS I spectra is a UVES I spectrum of a non-magnetic star with similar effective temperature as the magnetic star: the comparison star for WD 2047+372 is WD 1327–083, and the comparison star for WD 2359-434 is WD 1202-232. Data are binned in 0.2 Å boxes to improve S/N. All I spectra are normalised to 1.0 at ± 200 Å from Hα line centre, then shifted down from top I spectrum in steps of 0.1 for visibility. All V spectra are normalised to 0.0 outside the line core, then shifted down from top V spectrum in steps of 0.05.

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