Table 4. Optimized structural parameters and statistics for constrained EXAFS refinement of four different coordination geometries of Cu insulin.

Values marked with an asterisk have been restrained to be equal to a previous value owing to the symmetry of the model.

	Trigonal symmetric hexacoordinated	Tetragonally elongated hexacoordinated	Tetragonally distorted pentacoordinated	Pseudo-tetrahedral tetracoordinated
CuN2 ()	1.99 (1)	1.98 (1)	2.04 (1)	1.99 (1)
CuN2 ()	1.99 (1)*	1.98 (1)*	2.04 (1)*	1.99 (1)*
CuN2 ()	1.99 (1)*	2.02 (1)	1.98 (1)	1.99 (1)*
CuOw ()	2.15 (2)	2.17 (2)	2.23 (3)	2.11 (3)
CuOw ()	2.15 (2)*	2.17 (2)*	2.23 (3)*
CuOw ()	2.15 (2)*	2.37 (2)
N p	8	10	9	8
Fit index v 2	7.00	2.11	2.68	2.67
R exafs (%)	25.66	14.38	15.48	15.60