Localizing the union of bonding and antibonding sets produces atom-centered MAOs, where the sulfur valence orbitals are a set of 6 equivalent orbitals that are strongly polarized towards the fluorine atoms, as shown in the third image of Fig. . These 6 functions are linearly independent (though non-orthogonal), and combine with the conventional hybrid orbital on each F to form the strongly polarized σ SF orbitals. This hypervalent bonding problem is treated very naturally by the MAO analysis, while a minimal basis is insufficient to describe the occupied space since one in principle needs a set of 6 sp orbitals on sulfur.