Position-velocity diagrams (RA, Vel) of OH absorption at 1667 MHz of an ~2 region around Sgr A^∗. The lowest contour level is 75 mJy/beam (~3σ) and the contour spacing is also ~3σ. The horizontal line indicates the right ascension of Sgr A^∗, and panel e) is drawn at the declination of Sgr A^∗. (“MB” stands for molecular belt.)