Cloud complexes G1.3 and G1.6 and other sources in the picture of the GC region. Top panel: longitude-velocity diagram of CO 1–0 emission in the GC region (taken from Rodríguez-Fernández & Combes 2008) using data of Bally et al. (1987). Intensities were integrated over all negative Galactic latitudes. Solid lines indicate features such as Clump2 and dust lanes K and J (Rodríguez-Fernández et al. 2006). Middle panel: illustration of a possible face-on view of the GC region (taken from Rodríguez-Fernández et al. 2006). Bottom panels: recent simulations of the gas kinematics in the GC region by Sormani et al. (2019).