3D distribution, in supergalactic coordinates, of all galaxies with distance measurements in the surveyed M 101 group complex, centered at M 101. The red dots correspond to the major galaxies M 101, M 51, and M 63; the black dots indicate dwarf galaxies. The gray dots (shadows) appearing on the SGXSGZ– and SGYSGZ–walls are orthogonal projections. The best-fitting plane through the M 101 subgroup is shown as the gray plane and has a rms of only 46 kpc. The line of sight between the Milky Way and M 101 is indicated by the thick black line pointing downwards.