Fig. 2
Mean Hα flux (I) spectrum computed from all individual spectra, with standard deviation σ of individual spectra around the mean, shifted by +0.4 for clarity. The straight line at + 0.4 is the zero point for σ, also shifted upward by + 0.4. The left panel refers to WD 2047+372 (excluding spectrum E 1939614) and the right panel refers to WD 2359-434.
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