The full map of the CND in ﹩\mathrm{HCN}(J=1\mbox{--}0)﹩ emission from P.-Y. Hsieh et al. (2021). The dotted ellipse shows the extent of the CND (M. Tsuboi et al. 2018). The part of the CND considered for the calculations of the CO-to-H₂ conversion factor is outlined with the white contours. The position of Sgr A^* is marked with a white star.