Principal m = 2 components for NGC 4535. The upper panel shows the deprojected galaxy viewed in the r band. The second and third rows of panels concern the bar and the main spiral components, respectively. In the left we give the modules of the selected components (dot-dashed lines) and the total m = 2 modulus (solid line). In the right-hand panels we superpose the density of the component on the galaxy image. It is clear that these two components alone give a reasonable but not perfect reproduction of the main features of the galaxy. For a more detailed comparison, more components should be used.