Small maps performed at in CO(2 − 1) (left panels) and CO(1−0) (right panels) for the positions A, D and G. The green (resp. red) circles correspond to the FWHM of the CO(2−1) (resp. CO(1−0)) beams at the various positions observed. The corresponding offsets are: (0, 0), (+5, 0), (+2, +4) (−2, +4), (−5, 0), (−2,  −4), (+2,  −4). The spectra are superimposed on the corresponding A_B maps. They are positioned arbitrarily close to the beam corresponding to the observations.