Simple mean of the three α elements, Mg, Si, and Ca, for the NSD (green triangles). Also shown are the comparison samples of the Galactic disc (red circles and yellow diamonds), the inner-bulge (blue squares), and NSC populations (black stars). Typical uncertainties are given in the lower-right corner. The most uncertain determination of our abundance is for our coolest, most metal-rich, and faintest star, which is marked with a bracket.