Velocity-channel maps of the SiO(2–1) emission. Black contour levels for the molecular line emission (in the  scale) are from 0.08 K (3σ) to 0.64 K in steps of 0.08 K. White contour levels are from 0.64 K in steps of 0.32 K. Dashed countours correspond to the −3σ level. Velocity channels range from −130 to 130 km s^-1 by steps of 5 km s^-1 (the velocity width per channel). The central velocities of the velocity-channel maps are shown in the upper-left corner of each panel. The wedge at the side shows the intensity scale of the SiO(2–1) emission. The beam size (30′′) is shown at the bottom-left corner. Sgr A^∗ is the origin for the offset coordinates (in arcseconds).

Velocity-channel maps of the H¹³CO⁺(1–0) emission. Contour levels for the molecular line emission are from 0.08 K (3σ) in steps of 0.08 K. The other characteristics of the figure are the same as in Fig. A.1.

Same as Fig. A.2 but for the HN¹³C(1–0) emission.

Velocity-channel maps of the HNCO(5_0,5–4_0,4) emission. Black contour levels for the molecular line emission are from 0.11 K (3σ) to 0.44 K in steps of 0.11 K. White contour levels are from 0.44 K in steps of 0.44 K. In order to show more clearly the spatial distribution of the weak emission, the intensity scale has been saturated. The other characteristics of the figure are the same as in Fig. A.1.

Velocity-channel maps of the C¹⁸O(1–0) emission. Contour levels for the molecular line emission are from 0.11 K (3σ) in steps of 0.11 K. The other characteristics of the figure are the same as in Fig. A.1.

X/CS(1–0) intensity ratios in the same selected velocity ranges as Fig. 2. X stands for SiO(2–1), H¹³CO⁺(1–0), HN¹³C(1–0), HNCO(5–4), and C¹⁸O(1–0). Molecular emission is shown in contour levels, which are −3σ (dashed contour), 3σ, from 2.0 to 8 in steps of 1.5 K km s^-1. The 3σ level of each molecule is the same as in Fig. 2. Intensity ratio maps take upper and lower limits into account, using the 3σ value of each map as the limit value. The wedges to the left show the color scale of the different intensity ratios. Row at the bottom shows CS(1–0) maps of Tsuboi et al. (1999) to compare and show which pixels present meaningful ratios or are only limits (their contour levels and intensity scale are the same as in Fig. 2).