Fig. 3
(1) Phase-binned and stacked spectra of SDSS J0039. The spectra have been continuum-normalised and plotted with offsets of +3. (2) Phase-binned and trailed spectra in the region of Hα. (3) Phase-binned and trailed spectra in the region of the He I 6678 Å emission line. The He I spectra have been smoothed with a Savitsky-Golay filter for display purposes.
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