Fig. 1
Interstellar lines along the line-of-sight to RS Oph: Ca ii K (upper), Na i D1 (middle), and K i λ7665 (lower) on day −672. The vertical dashed lines mark the main components (see text). The dashed-dotted line indicates the systemic velocity (− 40.2 km s-1, Fekel et al. 2000). The green curve is a synthetic telluric absorption spectrum matched to the observed spectrum.
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