Comparison of observed data and two degenerate models of NGC 4945. Moment maps of observed data (top panels) and of two models with high radial outflow velocity and incorrect inclination with respect to the plane of the sky, incorrect outer opening angle, and incorrect systemic velocity (middle and bottom panels) with respect to the best model shown in Fig. 12. See Sect. 2.6 for details of the parameters of the degenerate models and how to overcome them.