Satellites of M 31 (circles). The blue and red satellites belong to the GPoA. The satellites in blue are approaching Earth from the coordinate system connected with M 31, the satellites in red are receding. The arrow indicates the spin of the M 31 galactic disk. Compare to the model shown in Fig. 13. The area covered by the PAndAS survey is shown in gray to facilitate the comparison with the image of the galaxy in Fig. 15. Image courtesy Marcel Pawlowski (adapted from Fig. 11 in Bullock & Boylan-Kolchin 2017).