Fig. 9a and b. Intensity of the (P1, solid line) and (P2, dash) Fourier components of the potential (more exactly the corresponding components of the tangential force normalized by the radial force), a) for the mass model with dominating disk of NGC 3593. The dotted line displays the energy dissipated in gas cloud collisions, in arbitrary units (Tdis); b) for the mass model with dominating halo.