Chemical abundances of α-elements taken from the APOGEE DR17 catalog for dwarf galaxies (color points with x, y error bars), with Hasselquist et al. (2021) selection. Color solid curves show the approximation of the data points by piecewise functions consisting of two or three straight lines representing the average behaviour of α-elements relative to iron. Dark gray solid curves have been obtained by averaging the data in each metallicity bin. Typically, the bin width is equal to 0.1 dex, but in some ranges where there are too few stars, it is increased up to 0.2 dex. For comparison, the behaviour typical for the MW is shown by gray dashed curve (McWilliam (1997)).