Distribution of α-abundances vs. metallicity for the LMC (small gray dots) and SMC (small magenta dots). Also included are the density of the Milky Way stars (orange) and the six substructures analyzed in this study (filled colored circles with error bars, which represent the standard deviation of each region). The left panels show the means of our substructure fields, while the right panels show the individual stars in each field. In the top right of each panel the representative errors for the LMC, SMC, and MW stars from the APOGEE pipeline (ASPCAP) are also shown. The solid black line and the solid magenta line represent the best polynomial fit for the LMC and SMC stars, respectively.