[Mg i/Fe], [Si i/Fe], [Ca i/Fe], and [Ti i/Fe] ratios plotted against [Fe/H] for the studied stars in NGC 5053 (filled black squares) and NGC 5634 (filled black circles), compared with Sgr dSph main body populations (open black circles, Sbordone et al., in prep.; open black diamonds, Sbordone et al. 2007), and mean values for five globular clusters related to Sgr dSph: Ter 8 (red asterisk), Arp 2 (open red triangle), M 54 (open red diamond), Pal 12 (open star), and Ter 7 (open red square). Small open gray triangles are Milky Way stars (Venn et al. 2004; Reddy et al. 2006). Large open cyan symbols are MW globular clusters NGC 6397 (square) and NGC 5897 (triangle). The large open black square connected by a dashed line with the filled black square represents the result for NGC 5053 when plotting [α/Fe i] vs. [Fe i/H], with the latter represented by the open symbol.