“…Having calculated, along with the hfi characteristics, the coordinates of all C sites in the relaxed cluster, we determined the locations of the above-mentioned 'colored' stable positions in the cluster, which are shown in figure 2 where the corresponding positions are presented by the same colors as their 'lifetimes' shown in figure 1(b). The four most stable positions-7, 8, 269 and 505, shown in figure 1(b) in red-are just the expected, and previously considered [18][19][20], 'axial' positions. The other near-stable 'colored' positions in figure 1(b) having numbers in the 200s (plus positions 4, 5, and 6, shown in black) are located in the diamond lattice bilayer (see, e.g., [32]) being perpendicular to the NV axis and passing through the vacancy (see figure 2 for better illustration).…”