Table 2. XAS data-collection specifications.

	EXAFS		XANES
	Ni insulin	Cu insulin	Cu insulin
K edge (eV)	8333	8979	8979	8979	8979
Scan range (eV)	81839333	88299829	88599099	88599099	88599099
Scan time per spectrum (min)	55	35	10	10	10
Saccharose protection	No	Yes	No	Yes	Yes
Temperature (K)	100	20	100	100	20
No. of scans	3	3	12	8	29
Dose per scan (MGy)	0.50	0.30	0.09	0.09	0.09