Fig. 4.22 Schematic representations of the ligand group orbitals (LGOs) for a D3h F3 fragment, the geometry of which is
analogous to that in BF3 (the position of the B atom is marked by the dot in the top left-hand diagram); the F3 triangle lies in the
xy plane. Orbitals LGO(5), LGO(8) and LGO(9) contain contributions from the 2pz atomic orbitals, directed perpendicular to the
F3 triangle. The relative sizes of the lobes in each diagram approximately represent the relative contributions made by the fluorine
atomic orbitals to each ligand group orbital.