Table 2. Distances between the iron ion and liganding atoms.

Values are in . SD, standard deviation.

	Atom liganding to iron ion
Protomer	Asp78O1	Asp78O2	Glu82O2	His51N2	Water 1	Water 2
A	2.33	2.31	1.95	2.18	1.93	2.21
B	2.28	2.31	1.95	2.18	2.00	2.22
C	2.31	2.30	1.96	2.19	1.85	2.22
D	2.33	2.31	1.97	2.16	1.96	2.15
E	2.32	2.33	1.97	2.17	1.95	2.17
F	2.31	2.33	1.94	2.20	1.92	2.18
G	2.34	2.32	1.98	2.18	1.90	2.18
H	2.33	2.33	1.97	2.15	1.93	2.26
I	2.32	2.36	1.95	2.18	1.83	2.17
J	2.27	2.34	1.97	2.21	1.88	2.12
K	2.32	2.35	1.93	2.18	1.81	2.24
L	2.34	2.38	1.95	2.16	1.93	2.22
Mean SD	2.32 0.02	2.33 0.02	1.96 0.01	2.18 0.02	1.91 0.06	2.19 0.04