Example of the Raman scattered O vi 6825 Å line during the quiescent phase (blue line; August 29.945, 2013) and the outburst (magenta line; August 28.927, 2015). Flux of the original O vi 1032 Å line (grey line; June 5.618, 2003) was scaled to that of the Raman line from quiescence. The radial velocity scale corresponds to the velocity space of the original O vi line for the systemic velocity of –16 km s-1 (Fekel et al. 2000) and the wavelength of the Raman transition, 6825.44 Å (Schmid 1989).
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