Channel maps of the ¹²CO(2–1) observations carried out with the IRAM 30 m telescope. Each panel represents the emission integratedover an interval of velocity along the line of sight. Velocity intervals are indicated on the top left corner of each panel. Velocity channels represented in this figure are between v = − 24 km s⁻¹ and v = +12 km s⁻¹, covering all the spectral features detected toward the extended G region. Structures described in Sect. 3.2are indicated with the corresponding letters.