Workflow showing the different steps involved in this study. From left to right, first, we start from the NIR image from Spitzer. Next, we apply the ICA technique to this image, in order to derive the gravitational potential in the plane of the galaxy (third step). In the fourth step, we compute forces to create a non-weighted torque map. In that image we represent, for clarity, the bar (as a cyan-contoured ellipse) and white contours corresponding to [5σ, 15σ, 45σ, ..., 0.9σ_max] in the CO map, with σ the mean value of the gas map and σ_max its maximum value. Finally, in the fifth step, by weighting the torques by the gas and azimuthally averaging the result, we obtain a torque profile, where we estimate the CR location (pink dot) inside the 0.75R_bar − 2.25R_bar region (green shaded region).