The torque, or more precisely the fraction of the angular momentum transferred from/to the gas in one rotation (dL/L), computed with the HST-NICMOS F160W image, is plotted for ¹²CO(1–0) (left) and ¹²CO(2–1) (right). The (red) dashed area corresponds to the resolution limit of our observations. In the left panel, the limiting factor is the ¹²CO(1–0) map resolution (~125 pc), while, on the right, the ¹²CO(2–1) map resolution (~59 pc). In the right panel, the (green) vertical dashed line at 0.51 kpc indicates the ¹²CO(2–1) FOV at the PdBI.