Radial distribution of the torque, quantified by the fraction of the angular momentum transferred from the gas in one rotation–dL/L, estimated from the CO(3–2) deprojected map. The vertical dashed line at 25 pc radius delimitates the extent of the central gas outflow, and the computation has no meaning here. The torque is negative inside the ≲100 pc nuclear spiral and in the winding arms and positive in the filaments.