Ranges of divisions in valence band structures of (La_0.5Bi_0.5O)CuCh (Ch = S, Se, Te) systems.

System	Division level (level width) (in eV)
	Lower bonding	Upper bonding	Nonbonding	Antibonding
(La0.5Bi0.5O)CuS	−6.28 to −4.58 (1.70)	−4.58 to −3.16 (1.42)	−3.16 to −1.42 (1.74)	−1.42 to −0.21 (1.21)
(La0.5Bi0.5O)CuSe	−6.09 to −4.50 (1.59)	−4.50 to −2.59 (1.91)	−2.59 to −1.35 (1.24)	−1.35 to −0.09 (1.26)
(La0.5Bi0.5O)CuTe	−6.00 to −4.45 (1.55)	−4.45 to −2.67 (1.78)	−2.67 to −1.66 (1.01)	−1.66 to −0.01 (1.65)