Location of the GCs and major substructures in the M 31 halo. The filled circles represent the outer-halo GCs with parameter estimates in our study, while the crosses represent the outer-halo GCs without parameter estimates. The types of substructures are A: stream A, B: stream B, C: stream C, D: eastern arc (Stream D), G: giant stream, NE: NE structure, NW: NW stream, and SW: SW cloud. The contours of these substructures are from Fig. 3 of Mackey et al. (2010). The dashed ellipse has a semimajor axis of 2° (27 kpc) representing a disc.