(Movie online, left plot) Filamentary structure of the local M 81 group including all galaxies of Table A.2. Determining the directions of smallest extent for all 103 galaxies anchored at their mean location, the normal vector to the grey plane was obtained. An analogous calculation for the volume in a 3 Mpc radius around M 81 yielded the red plane and its normal direction. For the volume in the 0.25 Mpc radius around M 81, the blue plane and its normal direction were obtained. The former two planes become more aligned to the SGX-SGY-plane for increasing volume size. For further orientation, the most luminous galaxies in our dataset are marked in colour and their names are attached. The right plot shows a projection into the plane of SGL and the distance from us, and also shows the locations of the mean, median, and centre of mass of the six most luminous galaxies.