Fig. 2.
Emission lines of ES Cet at 4686 Å (dotted line) and 6560 Å (black line). The 6560 Å line was converted into velocity space treated as a HeII line with a central wavelength of 6560.10 Å (left panel), and as a Hα line with a central wavelength of 6562.72 Å (right panel). Both lines are shifted, but the discrepancy is more significant for the Hα case (see Sect. 3).
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