Leftmost panel: disk samples with 3.5 < R < 8 kpc and 0 < |z| < 1 kpc without metal-poor stellar-halo contamination removed. Three right panels: distributions in [Al/Fe]-[Fe/H] plane of thick disk, thin disk, and the bulge. The dashed red line indicates where [Al/Fe]= −0.15. The solid red line represents the linear fit for high-Al ([Al/Fe]) metal-rich stars when 0 < [Fe/H] < 0.25, where m is the slope and b is the intercept. 145 out of 179 low-Al metal-rich bulge stars exhibit thick-disk-like chemical characteristics.