Top panel: dynamical map on the R–V_θ plane constructed with only the bar/bulge perturbation, for the basic set of parameters (Table 1) and the initial p_R = 0 and φ = 78.°8 (see text). The light grey tones represent regular orbits, while increasingly dark tones correspond to increasing instabilities and chaotic motion. The red-hatched regions contain strongly unstable and escaping orbits. The rotation curve is shown by a blue line. A dashed line delimits the initial conditions whose trajectories are inside or cross the central bar. The position of the Sun is shown by a blue cross symbol. Bottom panel: dynamical spectrum calculated with the bar model, along with a rotation curve shown by the continuous blue curve in the top panel. The proper frequency of the azimuthal oscillation, f_φ, and its harmonics are represented by black lines, while the frequency of the radial oscillation, f_R, is represented by a red line. The location of the corotation, ILR and OLR, is indicated by vertical dashed lines.