Galactic rotation velocity derived for the APOGEE-TGAS (DR12) sample. Stars chemically associated with the thin and thick disks are shown as black and red dots, respectively. The average values found in the boxes introduced in Fig. 1 are shown as triangles, and the straight lines correspond to linear least-squares fits to the average values. The filled circles correspond to the intermediate-[α/Fe] stars not included in the thin or thick disk samples. The average values typically come in pairs at any given [Fe/H], since both the thin and thick disk populations are covered by two rows of boxes in Fig. 1.
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