Comparison between the SiO(2–1) maps (background images) obtained by Amo-Baladrón et al. (2011) and our H₂O maps at 988 GHz (first row) and 557 GHz (second row). The velocity ranges are indicated at the top of each column. The wedges at the top of the first row show the SiO(2–1) intensity gray scale in K km s⁻¹. H₂O contour levels (in blue and white for the absorption and emission, respectively) start at 3σ (−3σ) for the emission (absorption) at the two H₂O frequencies, and they increase in 5σ (−5σ) and 4σ steps at 557 and 988 GHz, respectively. The red star represents Sgr A^* and origin of the offsets in arcsec. Crosses and their numbers show positions associated with GC sources labeled in the second row. H₂O spectra fromthose positions are shown in Fig. 3. The water and SiO(2–1) maps have the same beam size of 38′′ shown in the left corner of the first column.