Each column corresponds to one bar orientation of Fig. 1. Left column: Bar along the minor axis. Right column: Bar along the major axis. Parameters fitted by 3D-Barolo with a free PA and a free inclination angle. Each marker corresponds to one “true” inclination value i_true ∈ ±[30° ,80° ], the one we input to create the cube. The different parameters are plotted as a function of the galactocentric radius and the blue area highlights the bar region. First row: PA obtained at the end of step 1. Second row: Inclination angles obtained at the end of step 1. Third row: Rotation curves obtained after step 2. The black curve represents the expected circular velocity (Eq. (6)) computed from the gravitational potential (Eq. (4)). Fourth row: Radial velocity with the sign convention: negative toward the center.