Observed stellar [α/M] vs. [M/H] abundance ratios from MWM DR19 (Meszaros et al., in prep.). The top panel shows a density plot for all the stars published, while the disk stars involved in the quality disk sample at the galactocentric regions 3 kpc ≤ R ≤ 15 kpc are depicted in the bottom panel. Color-coding of the bins starts from two, and gray squares represent bins containing a single star. The total number of stars is denoted by N.