Number of particles per bin (top) and transverse velocities V_T (bottom) as a function of longitude and distance from the Sun. We have binned this space in bins of Δl = 10° and ΔD = 0.5 kpc. We show the axisymmetric model (left), the TWA1 model (middle), and the difference between these two (right). We superpose the spiral arms locus (black thick line) in these coordinates and the main resonances with curves as in Fig. 3.