1	NFS	Fe(4)-ni(1)-S(5) cluster	1.000
2	RQM	Fe(3)-ni(1)-S(4) cluster	0.900
3	BF8	Fe(4)-ni(1)-S(5) cluster with oxygen	0.818
4	MSK	Broken Fe4S4 cluster	0.800
5	XCC	Fe(4)-ni(1)-S(4) cluster	0.727
6	F3S	Fe3-s4 cluster	0.700
7	SF3	Fe4-s3 cluster	0.700