¹²CO (J = 3−2) integrated intensity map of the inner 2′ of the Galaxy obtained with the IRAM 30 m telescope and dominated by emission from the CND (color scale in K km s⁻¹). The square box shows the field of view observed by ALMA in ¹²CO (J = 3−2) revealing high positive-velocity cloudlets inside the cavity (Goicoechea et al. 2018). The gray curves show representative orbits CND with 1.5 and 2.3 pc de-projected radii. The black, blue, and gray dashed circles centered at Sgr A^* (black star) show HIFI’s HPBWs at multiple frequencies (from ~11″ to ~40″).