Left to right columns: XX, YY, XX − YY, and XX – a^CI(ν)YYsynthesized intensity maps of selected velocity channels. These images were generated using the 12 m array data only (Sect. 2), and were further tapered by a Gaussian weighting function of . The Ci line emission close to v_lsr ~ 20 km s^-1 is subject to foreground absorption, such that the images are dominated by the point-like absorption signature against Sgr A*. Extended Ci emission features surrounding Sgr A* are present away from v_lsr ~ 20 km s^-1.