Table 3. Percentages of each form of iron relative to the total amount of 57Fe.
| Diiron Center | As-isolated RIC | [56Fe RIC + 57Fe] |
| Diferric | ||
| A | 28 | 12 |
| B | 28 | 12 |
| Mixed valence | ||
| FeIII | 22 | 51 |
| FeII | 22 | 15 |
| Ferrous | - | 10 |
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