“…The high accuracy and precision of electronic structure measurements in inorganic solids with a high degree of crystal perfection by quantitative convergent-beam electron diffraction (QCBED) is now well established (Zuo et al, 1988;Bird & Saunders, 1992;Zuo, 1993;Deininger et al, 1994;Holmestad et al, 1995;Peng & Zuo, 1995;Saunders et al, 1995Saunders et al, , 1996Saunders et al, , 1999Zuo et al, 1997Zuo et al, , 1999Tsuda & Tanaka, 1999;Streltsov et al, 2001Streltsov et al, , 2003Tsuda et al, 2002;Jiang et al, 2003;Ogata et al, 2004;Friis, Madsen et al, 2003;Friis et al, 2004Friis et al, , 2005Nakashima, 2005Nakashima, , 2007. Such measurements are precise enough to allow meaningful comparisons of experimentally measured electronic structure with different ab initio theoretical models (Zuo et al, 1997(Zuo et al, , 1999Saunders et al, 1999;Friis, Madsen et al, 2003;Friis et al, 2004Friis et al, , 2005Nakashima, 2005), including those derived from density functional theory and periodic Hartree-Fock, Dirac-Fock and linear combination of atomic orbitals calculations.…”