[α/Fe] vs. [Fe/H] for the whole sample. Magenta asterisks represent the stars belonging to the halo by their kinematics. The black dotted line is the fiducial for division into thin- and thick disk populations. The black filled squares refer to the thick disk stars, blue triangles to the hαmr, and the red dots to the thin disk stars. On the top-right corner we plot the histogram of the distribution of [α/Fe], after the fiducial model (separation curve) is subtracted.