Fig. 3
Interstellar lines in the spectrum of HD 64315. The main panel shows the components of the Na i D doublet (5889.95 Å solid line; 5895.92 Å dashed line) in velocity space. The inset shows the Galactic rotation curve along this line of sight. The velocities are measured with respect to the local standard of rest (LSR) assuming a solar motion of + 16.6 km s-1 towards Galactic coordinates ℓ = 53°; b = + 25°.
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