Nearly identical spatial distribution of H¹³CN (J = 4–3) and SO (8₉–7₈) from ALMA interferometer data alone (zero-spacing data not merged). The two top left panels show total integrated line intensity maps. The other maps show H¹³CN (J = 4–3) (black images) and SO (8₉–7₈) (magenta contours) channel maps from v_LSR=−150 to +150 km s⁻¹ in steps of 10 km s⁻¹. At all velocities, most H¹³CN and SO features spatially match (i.e., they belong to the same gas structure). The emission features seen at negative velocities without SO emission counterpart, however, do not arise from blue-shifted H¹³CN emission butfrom red-shifted ¹²CO cloudlets. Sgr A^* is at position (0″, 0″).