Fig. 1. Contour map of the integrated H I-image of NGC 4449. This image was kindly provided by Hunter et al. (1998)

Fig. 2. Projection of the particle positions into the orbital plane for a distance of d_min = 42 kpc between both galaxies.
The diagram in the upper left panel corresponds to the configuration for a parabolic encounter reached 2.8·10⁸ yr after the closest approach of 30 kpc. The mass ratio is set to q = 0.15. The original H I-disk has an inclination of i = 60°, a position angle α = 230° and a radial extent of R_max = 27 kpc.
In clockwise direction, the inclination is changed to i = 80° or the radial extent of the disk to R_max = 20 kpc or the mass ratio to q = 0.05.
The central particles are omitted