Fig. 2
Top left: interstellar Na i D doublet (5890 Å full line, 5896 Å dashed line) in the spectrum of BD + 60° 73. Bottom left: the Ca ii K line at 3934 Å, displaying a similar morphology, but somewhat lower S/N. Right: radial velocity with respect to the local standard of rest (LSR) due to galactic rotation as a function of distance, using the rotation curve of Brand & Blitz (1993, black curve) and that of Reid et al. (2009, red curve).
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