Example of deprojections with HyperLeda and P4 orientation parameters (﹩{(b/a)}_{\mathrm{outer}}﹩ and PA_outer) for NGC 3992. The red and green ellipses on the original image in the left illustrate the HyperLeda and P4 parameters, respectively (semimajor axis of the ellipse equals R_gal), the panel in the middle shows the deprojection with HyperLeda orientation, and that in the right with P4 parameters: here the inclination is taken simply as ﹩i={\mathrm{cos}}^{-1}(b/a)﹩ (note that this differs from the inclination (“incl”) listed in HyperLeda, which includes a morphological type-dependent correction for the assumed disk thickness). Clearly, the face-on disk is closer to axisymmetric when using P4 parameters: the difference would remain if the thickness-corrected HyperLeda inclination were used (47° for this example). Similar plots for all sample galaxies can be found in the P4 web site.