Spatial distribution of target stars in the debris streams of Sgr. Upper panels: a plot of Sgr RHB stars in the leading and trailing arms in an X _GC– Z _GC map. Green and blue points indicate arm 1 and arm 2, respectively, in the leading and trailing arms. The large black point indicates the location of the Galactic center, while the asterisk indicates the location of the Sun. Lower panels: a plot of the Galactic RHB stars in an X _GC– Z _GC map.